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PRODUCT SUMMARY
SKY74076: Receiver for Dual-Band CDMA and GPS Mobile Handset Applications
Applications
* CDMA and GPS phones stage cellular LNA (high, mid, and bypass) and a high gain GPS LNA. After RF LNA signal amplification and filtering from the antenna, the received signal is mixed down from RF to IF. There are separate mixers for CDMA cellular and GPS modes. The CDMA mixer has balanced outputs for the IF SAW filters and can be combined externally to mate to a single-ended SAW filter. The GPS mixers have a differential output for an external LC bandpass filter. After IF filtering, the IF signal is amplified by a Variable Gain Amplifier (VGA) and sent to an I/Q demodulator, resulting in baseband I/Q signals at the output. The SKY74076 is also designed with two Local Oscillator (LO) input ports, one for the CDMA mixer and one for the GPS mixer. These mixers operate at different RF frequency inputs, but have the same IF frequency output. This usually refers to a single IF (SIF) plan at 183.6 MHz. The CELL_LO signal (pin 30) provides an LO port for the CDMA cellular mixer. In the cellular band, an internal divider divides the frequency by two, which provides the LO input to the cellular mixer. Only one external VCO is required for the UHF PLL. Additionally, the mixer LO signal is coupled and amplified internally, which provides another RF signal to drive the transmitter upconverter LO port. The VGA has a minimum dynamic range of 90 dB with a control voltage range of 0.5 to 2.5 V, which is common to all modes. A VHF oscillator operates with external tank circuits to provide LO frequencies for the I/Q demodulator in the cellular, PCS, and GPS modes. The noise figure, gain, and 3rd order Input Intercept Point (IIP3) of each stage in the receiver chip are optimized to meet the system requirements for CDMA modes according to TIA/EIA-98-C. The SKY74076 design employs BiCMOS technology for low cost, high performance, and a high level of integration. A block diagram of the SKY74076 is shown in Figure 1.
Features
* Three-step gain control cellular LNA * GPS LNA * External resistor to adjust LNA bias current * Independent CDMA and GPS mixers * Buffer LO signal for transmit upconverter * Dynamic range VGA, 90 dB * VHF oscillator, 200 MHz to 600 MHz * Battery cell operation (2.7 V < Vcc < 3.3 V) * RFLGATM (40-pin, 6 x 6 x 1 mm) Pb-free (MSL3, 260 C per JEDEC J-STD-020) package with downset paddle Skyworks offers lead (Pb)-free "environmentally friendly" packaging that is RoHS compliant (European Parliament for the Restriction of Hazardous Substances).
Description
The SKY74076 is a single Intermediate Frequency (IF), dual-band, receiver for Code Division Multiple Access (CDMA) and Global Positioning System (GPS) applications. The device is a highly integrated super-heterodyne receiver. Except for the Surface Acoustic Wave (SAW) filters and matching components, the SKY74076 incorporates all the components required to implement the receiver chain, from the Low-Noise Amplifier (LNA) to the In-Phase and Quadrature (I/Q) demodulator stages. Two LNAs are in the front-end receiver: a three-step gain
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com
103087C * Skyworks Proprietary and Confidential information * Products and Product Information are Subject to Change Without Notice * January 24, 2005 1
PRODUCT SUMMARY * SKY74076
CELL_LNA_OUT
GPS_LNA_OUT
CELL_MIX_IN
GPS_MIX_IN
CELL_LO
GPS_LO
GPS_LNA_IN
LNA1 LNA2
LO_OUT /2
CELL_LNA_IN
GPS_MIX_OUT- GPS_MIX_OUT+ MIX_OUT+ MIX_OUT-
VCOTNK-
GPS_VGA_IN VGA_IN+
0o
VCOTNK+ /2
90o
VGA_IN-
PLL
Q+
Q-
I+
I-
C1400
Figure 2. SKY74076 Receiver Block Diagram
Ordering Information
Model Name SKY74076 CDMA/GPS Receiver Manufacturing Part Number SKY74076-11 Product Revision
Copyright (c) 2003, 2005, Skyworks Solutions, Inc. All Rights Reserved. Information in this document is provided in connection with Skyworks Solutions, Inc. ("Skyworks") products. These materials are provided by Skyworks as a service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials. Skyworks may make changes to its documentation, products, specifications and product descriptions at any time, without notice. Skyworks makes no commitment to update the information and shall have no responsibility whatsoever for conflicts, incompatibilities, or other difficulties arising from future changes to its documentation, products, specifications and product descriptions. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by or under this document. Except as may be provided in Skyworks Terms and Conditions of Sale for such products, Skyworks assumes no liability whatsoever in association with its documentation, products, specifications and product descriptions. THESE MATERIALS ARE PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS OR IMPLIED OR OTHERWISE, RELATING TO SALE AND/OR USE OF SKYWORKS PRODUCTS INCLUDING WARRANTIES RELATING TO FITNESS FOR A PARTICULAR PURPOSE, MERCHANTABILITY, PERFORMANCE, QUALITY OR NON-INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. SKYWORKS FURTHER DOES NOT WARRANT THE ACCURACY OR COMPLETENESS OF THE INFORMATION, TEXT, GRAPHICS OR OTHER ITEMS CONTAINED WITHIN THESE MATERIALS. SKYWORKS SHALL NOT BE LIABLE FOR ANY DAMAGES, INCLUDING SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, INCLUDING WITHOUT LIMITATION, LOST REVENUES OR LOST PROFITS THAT MAY RESULT FROM THE USE OF THESE MATERIALS WHETHER OR NOT THE RECIPIENT OF MATERIALS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. Skyworks products are not intended for use in medical, lifesaving or life-sustaining applications. Skyworks customers using or selling Skyworks products for use in such applications do so at their own risk and agree to fully indemnify Skyworks for any damages resulting from such improper use or sale. The following are trademarks of Skyworks Solutions, Inc.: Skyworks(R), the Skyworks logo, and Breakthrough Simplicity(R). Product names or services listed in this publication are for identification purposes only, and may be trademarks of Skyworks or other third parties. Third-party brands and names are the property of their respective owners. Additional information, posted at www.skyworksinc.com, is incorporated by reference.
Skyworks Solutions, Inc. * Phone [781] 376-3000 * Fax [781] 376-3100 * sales@skyworksinc.com * www.skyworksinc.com
2 January 24, 2005 * Skyworks Proprietary and Confidential information * Products and Product Information are Subject to Change Without Notice * 103087C

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