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Tri-mode CDMA handsets
This highly integrated, super-heterodyne receiver comprises all
the critical components to implement the receiver chain:
starting from the Low-Noise Amplifier (LNA) to the In-Phase
and Quadrature (I/Q) demodulator stage, excluding the external
Surface Acoustic Wave (SAW) filters, bypass, and external
matching components. Two LNAs are in the front-end of the
receiver. The cellular LNA has three gain stages (bypass, mid,
and high), and the PCS LNA has two gain stages (bypass and
high).
After RF signal amplification and SAW filtering from the
antenna, the signal is mixed down from RF to the IF by the
mixer 鈥?one independent mixer for each individual band. The
CDMA cellular and PCS mixer outputs are shared in a
differential output to accommodate a single IF frequency plan,
while the AMPS mixer differential output is matched to a
differential input SAW filter, and SAW filter output is matched
single-ended into a Variable Gain Amplifier (VGA). After external
IF filtering, the signal is amplified by a VGA and fed to an I/Q
demodulator, which outputs baseband I/Q signals. The VGA
has a minimum dynamic range of 90 dB with a control voltage
range from 0.3 to 2.5 V, and it is common to all modes. A VHF
oscillator with external tank circuitry provides the Local
Oscillator (LO) frequency for the I/Q demodulator.
With different frequency bands input to the mixer, the mixer LO
is tuned to have the same IF frequency output. Since IF
frequency is the same for all bands, it usually refers to a single
IF frequency plan at 183.6 MHz. One LO port for the AMPS,
CDMA, and PCS mixer is designed on the device. A divide-by-2
is used to switch the mixer LO frequency from PCS to the
cellular band. In addition, the LO oscillator signal is coupled out
and further amplified, providing an RF signal for the transmitter
upconverter LO port (LO_OUT).
The noise figure, gain, and third order Input Intercept Point
(IIP3) of each stage in the receiver are optimized to meet the
system requirements for AMPS and CDMA modes per TIA/EIA-
98-C. The CX74059 uses BiCMOS technology and is designed
for low cost, high performance, and a high level of integration.
A block diagram of the CX74059 is shown in Figure 1.
FEATURES
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Battery cell operation (2.7 V < VCC < 3.3 V)
Two-step gain control PCS LNA
Three-step gain control cellular LNA
External pot resistor to adjust LNA bias current
Independent cellular and PCS mixers
Single LO input signal for cellular and PCS mixer
Frequency divide-by-2 to switch mixer LO from PCS to cell
frequency range
Buffered LO signal for Tx upconverter
Single external UHF VCO is only required
90 dB dynamic range variable gain amplifier
I/Q demodulator
200 to 600 MHz VHF oscillator
VCO on/off control for standby current optimization
6 mm x 6 mm RFLGA鈩?package with downset paddle
DESCRIPTION
The CX74059 Application-Specific Integrated Circuit (ASIC) is a
single Intermediate Frequency (IF), multi-mode, dual-band
receiver designed for use in Code Division Multiple Access
(CDMA) portable phones implementing both cellular and
Personal Communications System (PCS), as well as Advanced
Mobile Phone System (AMPS) modes.
Skyworks Solutions, Inc. Proprietary and Confidential
103086A
[781] 376-3000 I FAX [781] 376-3100 I SALES@SKYWORKSINC.COM I WWW.SKYWORKSINC.COM
1
FEBRUARY 5, 2003
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