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IT3020 10 GHz Variable Gain Amplifier
Description
The IT3020 is a highly linear low noise differential variable gain amplifier with a bandwidth of DC to 10 GHz. It is suitable for Automatic Gain Control (AGC) in high bandwidth applications such as a 10/12.5 Gb/s STM-64/OC-192 receiver front end. Offset correction and shutoff control are provided. Both AC and DC coupling are allowed at the input and output. High sensitivity allows the device to be used at the output of a transimpedance amplifier. 3-dB bandwidth: 10 GHz Differential gain: 29 dB Bias supply: -5 V, 156 mA, and +5 V, 74 mA Power consumption: 1150 mW Gain control: 30 dB CMRR: Better than 25 dB DC offset correction Low RMS jitter Low-cost JEDEC QFP-N (MO-220) package
Features
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Absolute Maximum Ratings
S ymbol
Vee Vcc Vd Vm T ch T stg
Parameters/conditions
Power supply voltage negative Power supply voltage positive Applied voltage at data input (differential) Applied voltage at data input (single ended) Maximum channel temperature Storage temperature
Min.
-6 0
Max.
0 6 3 1.5 5 150
Units
V V V V mA
o
Ioffset(+),(-) Offset control current -65
C
150
C
Recommended Operating Symbol Conditions T c
Vee Vcc Iee Icc BR Vimn Vgc Vsh Vin_DC Vd_max Vm_max
Parameters/conditions
Operating temperature range (T case) Power supply voltage Power supply voltage Negative bias supply current Positive bias supply current Bit rate Offset control voltage Gain control voltage Shut-off control voltage Input/output interface Input DC voltage (DC coupling) Maximum differential input signal for linear mode Maximum single-ended input signal for linear mode
Min.
0 -5.25 4.75 146 65 -5 -3.2 -5
Typ.
-5 5 156 74
Max.
85 -4.75 5.25 167 82 12.5 5 0 0
Units
oC
V V mA mA Gb/s V V V V
AC and DC coupled 0 40 40 mVpp mVpp
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This is a Production data sheet. See "Product Status Definitions" on Web site or catalog for product development status.
March 27, 2006 Doc. 4084 Rev 2
1
iTerra Communications 2400 Geng Road, Ste. 100, Palo Alto, CA 94303 Phone (650) 424-1937, Fax (650) 424-1938
IT3020 10 GHz Variable Gain Amplifier
Electrical Characteristics
Symbol P G B3dB RLin RLout Voutdc Parame te rs/conditions Pow er consumption Single-ended small signal gain Gain control dynamic range 3 dB bandw idth Input return loss (up to 10 GHz) Output return loss (up to 10 GHz) Output DC voltage (DC coupled to 50 ohm load) Output pow er at 1-dB gain compression Frequency 2 GHz, maximum gain setting Saturated output pow er Frequency 2 GHz, maximum gain setting 3rd-order output intercept point Frequency 2 GHz, maximum gain setting THD Total harmonic distortion (up to 10 GHz, Pout = 0 dBm) Single-ended output Differential output Trse Tfse Jrms Rise time (20% - 80%) Fall time (20% - 80%) Jitter degradation Overshoot (Bit rate = 10 Gb/s, maximum gain setting) CMRR Common-mode rejection ratio (up to 10 GHz)) 25 36 37 0.7 -34 -42 39 39 1 6 dBm dBm ps ps ps % dB 4.5 6 15 9 12 10 Min. 1030 22 Typ. 1150 23 20 10 20 15 0 5.5 7 16 Max. 1260 Units mW dB dB GHz dB dB mV dBm dBm dBm
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P1dB Psat IP3O
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This is a Production data sheet. See "Product Status Definitions" on Web site or catalog for product development status.
March 27, 2006 Doc. 4084 Rev 2
2
iTerra Communications 2400 Geng Road, Ste. 100, Palo Alto, CA 94303 Phone (650) 424-1937, Fax (650) 424-1938
IT3020 10 GHz Variable Gain Amplifier
S-Parameter Data
30
(Measured on connectorized evaluation board)
IT3020 Single Ended Gain
0 -5 -10 S11 (dB) -15 -20 -25 -30 -35 -40 -45 -50
IT3020 Input Return Loss
25 20 S21 (dB) 15 10 5 0 -5 0 2 4 6 8 10 12 14 16 18 Freq (GHz)
Vee = -5 V, Vcc = 5 V Iee = 156 mA, Icc = 74 mA Vgc = 0 V, 10.2 mA Vsh = 0 V, 21.8 mA
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0
2
4
6
8
10
12 14
16 18
Freq (GHz)
IT3020 Output Return Loss
0 -5
IT3020 Isolation
0 -10 -20 -30 -40 -50 -60 -70 -80
S22 (dB)
-15 -20 -25 -30 0 2 4 6 8 10 12 14 16 18
S12 (dB)
-10
0
2
4
6
8
10 12 14 16 18
Freq (GHz)
Freq (GHz)
S21 Versus Temperature 0 to 80 oC
(Measured on connectorized evaluation board)
S21 vs. Temperature
28 26 24 S21 (dB) 22 20 18 16 14 12 10 0 1 2 3 4 5 6 7 8 9 10 Freq. (GHz)
T=25C T=70C T=80C T=50C T=0C
Vee = -5 V, Vcc = 5 V Iee = 156 mA, Icc = 74 mA Vgc = 0 V, 10.2 mA Vsh = 0 V, 21.8 mA
www.iterrac.com
This is a Production data sheet. See "Product Status Definitions" on Web site or catalog for product development status.
March 27, 2006 Doc. 4084 Rev 2
3
iTerra Communications 2400 Geng Road, Ste. 100, Palo Alto, CA 94303 Phone (650) 424-1937, Fax (650) 424-1938
IT3020 10 GHz Variable Gain Amplifier
Single-Ended Gain in Direct and Cross Port Configurations
Single Ended Gain (dB)
(Measured on connectorized Evaluation board)
Single Ended Gain Direct and Cross Port Configurations
28 27 26 25 24 23 22 21 20 19 18 17 16 15 0 1 2
Vee =-5 V, Vcc = 5 V www..com Iee = 156 mA, Icc = 74 mA Vgc = 0 V, 10.2 mA Vsh = 0 V, 21.8 mA
D to Q D to /Q
3
4
5
6
7
8
9
10
Freq (GHz)
Differential Gain and CMRR
Measured on connectorized Evaluation board)
Differential Gain
40 38 36 34 32 30 28 26 24 22 20 18 16 14 12 10 8 6 0 2 4 6 8 10 12 14 16 18
CMRR
50 46 42 38 34 30 26 22 18 14 10 0 2 4 6 8 10 12 14 16 18 Freq. (GHz)
Freq. (GHz)
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This is a Production data sheet. See "Product Status Definitions" on Web site or catalog for product development status.
CMRR (dB)
Gain (dB)
Vee = -5 V, Vcc = 5 V Iee = 156 mA, Icc = 74 mA Vgc = 0 V, 10.2 mA Vsh = 0 V, 21.8 mA
March 27, 2006 Doc. 4084 Rev 2
4
iTerra Communications 2400 Geng Road, Ste. 100, Palo Alto, CA 94303 Phone (650) 424-1937, Fax (650) 424-1938
IT3020 10 GHz Variable Gain Amplifier
S-Parameter Data, Varying Vgc (Gain Control)
(Measured on connectorized Evaluation board)
IT3020 Gain Control
60 50
20
IT3020 Input Return Loss vs Gain Control
0V -2 .5V -3 .2 V -1V -2 .8 V -2 V -3 V
Gain (dB)
20 10 0 -10 -20 -30 0 2 4 6 8 10 12 14 16 18
S11 (dB)
Vee =-5 V, Vcc = 5 V Iee = 156 mA, Icc = 74 mA www..com
40 30
0V -2.5V -3.2V
-1.5V -2.8V
-2V -3V
10 0 -10 -20 -30 -40 -50
Freq (GHz)
0
2
4
6
8
10
12
14
16
18
Freq (GHz)
iT3 0 2 0 Output R e turn Lo s s v s Ga in C o ntro l
15 10 5 0 -5 -10 -15 -20 -25 -30 0 2 4 6 8 10 12 14 16 18
30
-3.2V -2.5V 0V -3V -2V -2.8V -1V
Gain vs. Vgc
20
Gain (dB)
10 0 -10 -20 -30 -4 -3.5 -3 -2.5 -2 -1.5 -1 -0.5 0
F re q (GHz)
Vgc (V)
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This is a Production data sheet. See "Product Status Definitions" on Web site or catalog for product development status.
March 27, 2006 Doc. 4084 Rev 2
5
iTerra Communications 2400 Geng Road, Ste. 100, Palo Alto, CA 94303 Phone (650) 424-1937, Fax (650) 424-1938
IT3020 10 GHz Variable Gain Amplifier
Third Order Intercept Point Versus Frequency
Vee = -5 V, Iee = 156 mA Vcc = 5 V, Icc = 74 mA
OIP3 (dBm)
Third Order Intercept Point vs. Frequency
17 16 15 14 13 12 11 10 2 3 4 5 6 7 8 9 10
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Freq (GHz)
Gain Versus Output power At 10 GHz
23
Vee =-5 V, Iee = 156 mA Vcc = 5 V, Icc = 74 mA
Gain vs. Pout @ 10 GHz
22
G ain (d B )
21 20 19 18 17 -6 -5 -4 -3 -2 -1 0 1 2 3 4
P1dB=2dBm P3dB=3.8dBm
Output (dBm)
P1dB and Psat
Vee = -5 V, Iee = 156 mA Vcc = 5 V, Icc = 74 mA
P1dB and Psat
8 Compression Point (dBm) 7 6 5 4 3 2 1 2 3 4 567 Freq (GHz) 8 9 10
P 1dB P s at
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This is a Production data sheet. See "Product Status Definitions" on Web site or catalog for product development status.
March 27, 2006 Doc. 4084 Rev 2
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iTerra Communications 2400 Geng Road, Ste. 100, Palo Alto, CA 94303 Phone (650) 424-1937, Fax (650) 424-1938
IT3020 10 GHz Variable Gain Amplifier
(a) Total Harmonic Distortion at 0 dBm Single-Ended/ Differential
Vee =-5 V, Iee = 156 mA Vcc = 5 V, Icc = 74 mA
-20 -25 Harmonic Level (dB) -30 -35 -40 -45 -50 2
Total Harmonic Distortion at 0 dBm Output
S ingle Ende d
Total Harmonic Distortion Vs. Output Power at 10 GHz
-30
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Harmonic Level (dB)
Diffe re ntia l
-32
-34
(b) Total Harmonic Distortion Versus Output Power At 10 GHz
Vee =-5 V, Iee = 156 mA Vcc = 5 V, Icc = 74 mA
-36
-38
3
4
5
6 7 Freq (GHz)
8
9
10
-40 -10 -8 -6 -4 -2 0
Output Power (dBm)
(a)
(b)
(a) Second Harmonic Versus Frequency At 0 and -6 dBm
Vee = -5 V, Iee = 156 mA Vcc = 5 V, Icc = 74 mA
Harmonic Level (dB)
Second Harmonic Vs. Frequency at 0 and -6 dBm
-32
Third Harmonic Vs. Frequency at 0 and -6 dBm
-34 Harmonic Level (dB) -36 -38 -40 -42 -44 -46 -48
3Har_0dBm 3Har_-6dBm
-34 -36 -38 -40 -42 -44
2Har_0dBm 2Har_-6dBm
(b) Third Harmonic Versus Frequency At 0 and -6 dBm
Vee = -5 V, Iee = 156 mA Vcc = 5 V, Icc = 74 mA
2
3
4
5
6
7
8
9
10
2
3
4
5
6
7
8
9
10
Freq (GHz)
Freq (GHz)
(a)
(b)
*Differential THD is estimated from single-ended measurement. It is assumed to be equal to the third harmonic level at -3 dBm power output
This is a Production data sheet. See "Product Status Definitions" on Web site or catalog for product development status.
www.iterrac.com
March 27, 2006 Doc. 4084 Rev 2
7
iTerra Communications 2400 Geng Road, Ste. 100, Palo Alto, CA 94303 Phone (650) 424-1937, Fax (650) 424-1938
IT3020 10 GHz Variable Gain Amplifier
Eye Diagram Performance Versus Bit Rates
Vee = -5 V, Iee = 156 mA Vcc = 5 V, Icc = 74 mA Vin = 25 mV pp, Vgc = 0 V Differential input and www..com DC coupled
Bit rate: 1 Gb/s Through Line
Bit rate: 1 Gb/s Vout = 687 mVpp, tr = 40 ps, tf = 40 ps
Bit rate: 10 Gb/s Through Line
Bit rate: 10 Gb/s Vout = 690 mVpp, tr = 37.2 ps, tf = 34.3 ps
Bit rate: 12.5 Gb/s Through Line
Bit rate: 12.5 Gb/s Vout = 648 mVpp, tr = 36.7 ps, tf = 33.7 ps
www.iterrac.com
This is a Production data sheet. See "Product Status Definitions" on Web site or catalog for product development status.
March 27, 2006 Doc. 4084 Rev 2
8
iTerra Communications 2400 Geng Road, Ste. 100, Palo Alto, CA 94303 Phone (650) 424-1937, Fax (650) 424-1938
IT3020 10 GHz Variable Gain Amplifier
Eye Diagram Performance Versus Vgc
Vee = -5 V, Iee = 156 mA Vcc =5 V, Icc = 74 mA Vin = 25 mV pp, BR = 10 Gb/s
www..com Differential input and DC coupled
Vgc =-1.5 V Vout = 558 mV pp, tr = 37.2 ps, tf = 34.2 ps
Vgc = -1.75 V Vout = 503 mVpp, tr = 37.4 ps, tf = 35.6 ps
Vgc =-2 V Vout = 428 mV pp, tr = 37.5 ps, tf = 36.4 ps
Vgc = -2.25 V Vout = 333 mVpp, tr = 37 ps, tf = 37 ps
Vgc =-2.5 V Vout = 224 mV pp, tr = 35.5 ps, tf = 37 ps
Vgc =-2.8 V Vout = 94.8 mV pp, tr = 32.5 ps, 36.2 ps
www.iterrac.com
This is a Production data sheet. See "Product Status Definitions" on Web site or catalog for product development status.
March 27, 2006 Doc. 4084 Rev 2
9
iTerra Communications 2400 Geng Road, Ste. 100, Palo Alto, CA 94303 Phone (650) 424-1937, Fax (650) 424-1938
IT3020 10 GHz Variable Gain Amplifier
(a) RMS Additive Jitter Versus Bit Rate at Maximum Gain
1.3 RMS Additive Jitter (ps)
RMS Additive Jitter Vs. Bit Rate
1.4 1.2 1 0.8 0.6 0.4 0.2
RMS Additive Jitter Vs. Gain Control
1.1 1 0.9 0.8 0.7 0 3 6 9 12 15
(b) RMS Additive Jitter Versus Gain Control At 10 Gb/s
Vee = -5 V, Iee = 156 mA Vcc = 5 V, Icc = 74 mA Vin = 25 mV pp
RMS Additive Jitter (ps)
Vee = -5 V, Iee = 156 mA Vcc = 5 V, Icc = 74 mA Vin = 25 mV pp, Vgc = 0 V www..com
1.2
-3
-2.5
-2
-1.5 Vgc (V)
-1
-0.5
0
Bit Rate (Gb/s)
(a)
(b)
(a) Rise / Fall Time Versus Bit Rate at Maximum Gain
Vee = -5 V, Iee = 156 mA Vcc = 5 V, Icc = 74 mA Vin = 25 mV pp, Vgc = 0 V
38 37 36 35 34 33 0
Rise / Fall Time Vs. Bit Rate
40
Rise Time Fall Time
Rise / Fall Time Vs. Gain Control
Rise Time 38 Rise / Fall Time (ps) 36 34 32 30 Fall Time
(b) Rise / Fall Time Versus Gain Control At 10 Gb/s
Vee = -5 V, Iee = 156 mA Vcc = 5 V, Icc = 74 mA Vin = 25 mV pp
Rise / Fall Time (ps)
3
6
9
12
15
-3
-2.5
-2
-1.5 Vgc (V)
-1
-0.5
0
Bit Rate (Gb/s)
(a)
(b)
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This is a Production data sheet. See "Product Status Definitions" on Web site or catalog for product development status.
March 27, 2006 Doc. 4084 Rev 2
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iTerra Communications 2400 Geng Road, Ste. 100, Palo Alto, CA 94303 Phone (650) 424-1937, Fax (650) 424-1938
IT3020 10 GHz Variable Gain Amplifier
Square Wave Performance Varying Vgc At 5 Gb/s
Vee = -5 V, Iee = 156 mA Vcc = 5 V, Icc = 74 mA Vin = 25 mV pp
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Vgc =0 V Vout = 662.7 mV pp, Overshoot = 3.1 %
Vgc = -1.5 V Vout = 581.9 mVpp, Overshoot = 3.26 %
Vgc = -2 V Vout = 440.5 mVpp, Overshoot = 0.72 %
Vgc = -2.5 V Vout = 244.4 mVpp, Overshoot = 0.2 %
Vgc = -2.7 V Vout = 147.6 mVpp, Overshoot = 0.84 %
Vgc = -3 V Vout = 37.3 mVpp, Overshoot = 4.44 %
www.iterrac.com
This is a Production data sheet. See "Product Status Definitions" on Web site or catalog for product development status.
March 27, 2006 Doc. 4084 Rev 2
11
iTerra Communications 2400 Geng Road, Ste. 100, Palo Alto, CA 94303 Phone (650) 424-1937, Fax (650) 424-1938
IT3020 10 GHz Variable Gain Amplifier
Square Wave Performance Varying Vgc At 10 Gb/s
Vee = -5 V, Iee = 156 mA Vcc = 5 V, Icc = 74 mA Vin = 25 mV pp www..com
Vgc =0 V Vout = 591.9 mV pp, Overshoot = 5.82 %
Vgc = -1.5 V Vout = 587.8 mVpp, Overshoot = 5.73 %
Vgc = -2 V Vout = 433 mVpp, Overshoot = 1.75 %
Vgc = -2.5 V Vout = 239.5 mVpp, Overshoot = 0. 82 %
Vgc = -2.7 V Vout = 144.7 mVpp, Overshoot = 1.82 %
Vgc = -3 V Vout = 36.7 mVpp, Overshoot = 13.0 %
www.iterrac.com
This is a Production data sheet. See "Product Status Definitions" on Web site or catalog for product development status.
March 27, 2006 Doc. 4084 Rev 2
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iTerra Communications 2400 Geng Road, Ste. 100, Palo Alto, CA 94303 Phone (650) 424-1937, Fax (650) 424-1938
IT3020 10 GHz Variable Gain Amplifier
Performance as Function of Input Voltage
Vout (m Vpp)
Vee = -5 V, Iee = 156 mA Vcc = 5 V, Icc = 74 mA
1100 900 700 500 300 100 -100
0 10 20 30 40 50 60 70 80 90 100 110
Vin (mVpp) Vgc=0V Vgc=-1V Vgc=-1.5V Vgc=-2V
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Overshoot Versus Bit Rate at Maximum Gain
Overshoot (%)
Vee = -5 V, Iee = 156 mA Vcc = 5 V, Icc = 74 mA Vin = 25 mV pp, Vgc = 0 V
Overshoot Vs. Bit Rate 7 6 5 4 3 2 1 0 0.0 3.0 6.0 9.0 12.0 15.0 Bit rate (Gb/s)
Overshoot Versus Gain Control At 2, 5 and 10 Gb/s
Overshoot (%)
Vee = -5 V, Iee = 156 mA Vcc = 5 V, Icc = 74 mA Vin = 25 mV pp
Overshoot Vs. Gain Control
14 12 10 8 6 4 2 0 -3.0
2 Gb/s 5 Gb/s 10 Gb/s
-2.5
-2.0
-1.5 Vgc (V)
-1.0
-0.5
0.0
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This is a Production data sheet. See "Product Status Definitions" on Web site or catalog for product development status.
March 27, 2006 Doc. 4084 Rev 2
13
iTerra Communications 2400 Geng Road, Ste. 100, Palo Alto, CA 94303 Phone (650) 424-1937, Fax (650) 424-1938
IT3020 10 GHz Variable Gain Amplifier
Recommended Operational Setup
Apply -5 V at Vee, +5 V at Vcc Apply 0 V at Vsh and Vgc for maximum output
Vsh 0.1uF 100nF Vinp 100nF Vinn 0.1uF Vgc 0.1uF 560pF /D In 560pF D In 560pF
560pF
1uF
Vcc1
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Vcc2 560pF Q 1uF 100nF J3 Voutp 100nF J4 Voutn
DC blocking capacitors optional
IT3020
/Q
Vimn
Vee 560pF 1uF
Device System Diagram
Vcc1 Vsh Vcc2
Vinp Vinn Vimn 1 kOhm
Voutp Voutn
Vgc
Vee
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This is a Production data sheet. See "Product Status Definitions" on Web site or catalog for product development status.
March 27, 2006 Doc. 4084 Rev 2
14
iTerra Communications 2400 Geng Road, Ste. 100, Palo Alto, CA 94303 Phone (650) 424-1937, Fax (650) 424-1938
IT3020 10 GHz Variable Gain Amplifier
Package Drawings, Pinouts
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Pinouts:
P1: Gnd P2: Vinp (RF input) P3: Vinn (/RF input) P4: Gnd P5: Vgc (Gain control) P6: Vee (Negative supply) P7: N/C P8: N/C P9: Gnd P10: Voutp (/RF out) P11: Voutn (RF out) P12: Gnd P13: Vcc2 (positive supply) P14: Vsh (shutoff control) P15: Vcc1 (positive supply) P16: Vimn (input offset control)
Biasing Procedures:
Apply power supply in the following order: 1. Vgc 2. Vsh 3. Vcc-1&2 4. Vee
www.iterrac.com
This is a Production data sheet. See "Product Status Definitions" on Web site or catalog for product development status.
March 27, 2006 Doc. 4084 Rev 2
15
iTerra Communications 2400 Geng Road, Ste. 100, Palo Alto, CA 94303 Phone (650) 424-1937, Fax (650) 424-1938

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