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GPS receivers
DESCRIPTION
The CX74070 Application-Specific Integrated Circuit (ASIC) is a
single Intermediate Frequency (IF), dual-mode, dual-band
receiver intended for use in Code Division Multiple Access
(CDMA) phones in Personal Communications System (PCS) and
Global Positioning System (GPS) bands.
The CX74070 is a highly integrated super-heterodyne receiver.
Except for the Surface Acoustic Wave (SAW) filters and
matching components, the device 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. A PCS LNA and a GPS LNA are in the
front-end receiver.
After RF LNA signal amplification and filtering, the signal is
mixed down to an IF. The PCS mixer has balanced outputs for
the IF SAW filter and the GPS mixer has a differential output for
an external L-C bandpass IF filter. The IF signal is amplified by
a Variable Gain Amplifier (VGA) and fed to an I/Q demodulator,
resulting in baseband I/Q signals that interface with a
baseband analog processor.
The VGA has a minimum dynamic range of 90 dB with a
control voltage range of 0.3 to 2.5 V, which is common to all
modes. A VHF oscillator operates with external tank circuits to
provide Local Oscillator (LO) frequencies for the I/Q
demodulator in the PCS and GPS bands.
The noise figure, gain, and third order Input Intercept Point
(IIP3) of each stage have been optimized to meet the system
requirements for PCS mode according to TIA/EIA-98-C and for
GPS mode according to TIA/EIA-916. The ASIC design employs
BiCMOS technology for low cost, high performance, and a high
level of integration.
A block diagram of the CX74070 is shown in Figure 1.
FEATURES
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GPS LNA provided
External resistor to adjust LNA bias current
Independent PCS and GPS mixers
90 dB dynamic range VGA
I/Q demodulator
100 to 600 MHz VHF oscillator
Battery cell operation (2.7 V < Vcc < 3.3 V)
6 x 6 mm, 40-pin RFLGA鈩?package with down-set paddle
Skyworks Solutions, Inc. Proprietary and Confidential
103085A
[781] 376-3000 I FAX [781] 376-3100 I SALES@SKYWORKSINC.COM I WWW.SKYWORKSINC.COM
1
FEBRUARY 4, 2003
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