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參數(shù)資料
| 型號(hào)： | WE904 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | 0.1 - 1GHx Single Chip FM Transceiver |
| 中文描述： | 0.1 - 1GHx單芯片F(xiàn)M收發(fā)器 |
| 文件頁數(shù)： | 37/39頁 |
| 文件大小： | 623K |
| 代理商： | WE904 |
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Winceiver WE904/WE905
WiNEDGE & WiRELESS
0.1 - 1GHz Single Chip FM Transceiver
2003 WiNEDGE & WiRELESS PTE LTD
Page 7
Rev Date: 2003 May 27
Receive PLL Synthesizer and VCO
The receive PLL synthesizer with voltage controlled oscillator (VCO), is designed to provide a low
phase noise local oscillator. The Rx VCO operates in a balanced mode at 2x the Rx local oscillator
frequency. The VCO frequency is immediately divided by a factor of 2 to provide the local oscillator for
the quadrature down-conversion mixer. The synthesizer is 17 bits in total (excluding the proceeding
divide by 2). These 17 bits are split into 14 bits to provide the input to the PLL phase detector to be
compared with the reference frequency, with an additional 3 bits providing fractional-n capability, to
allow channel frequency definition in steps of 1/8 of the PLL reference frequency.
This LO signal also drives the receive synthesizer and demodulator synthesizer.
The Rx VCO center frequency is determined by an external tank circuit comprised of an external,
center-tapped, inductor. The tank circuit is connected to pin 41 and 42.
An external PLL loop filter network, connected to the RPLL pin (pin 39), filters the VCO control
voltage. This control voltage is used to tune the tank frequency of the VCO via an internal, common-
anode, varactor pair. The receive frequency for the WE904/905 is programmed via serial interface
(Data, Clock, and Load Enable).
Demodulator synthesizer
This synthesizer consists of programmable and fixed dividers which determine the IF frequency and
the demodulator bandwidth of the digital FM demodulator. The demodulator synthesizer is controlled
by 3 PDR bits of the reference frequency register, programmable via serial interface. The
demodulator bandwidth is programmable between 150kHz and 25kHz.
Variable Gain Amplifiers
The gain of the receiver can be dynamically adjusted via the serial interface to maintain signal linearity
before the demodulator. This enables the achievement of high values of SINAD for an analog FM link.
An Automatic Gain Control (AGC) function is also available on-chip. The gain can be adjusted in 3
locations along the receive path:
A 10dB RF pad before the down-conversion quadrature mixer
Four step baseband attenuators in the down-conversion quadrature mixer load circuits
Three-step baseband Variable Gain Amplifiers after the baseband I and Q low pass filters
In addition, each VGA provides differential to single-ended conversion and amplification of the
baseband signal, prior to the I/Q low-pass filters. These gain stages are referenced to pre-filter
ground (PFGND), an internally generated virtual ground.
LPF1 (I/Q)
This first stage of the I/Q baseband low pass filter (LPF) section consists of active, Sallen-key type
filters. These filters provide a combination of low noise figure and gain along with a wide dynamic
input range. The purpose of these filters is to provide preliminary rejection of the out-of-band
interferences. The reduction of out-of-band interferer levels, reduce the dynamic range requirements
for the following filter stages in LPF2. The –3dB corner frequency of these LPFs are set via external
RC values.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| WE905 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:0.1 - 1GHx Single Chip FM Transceiver |
| WE9104 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Pulse Telephone Dialer |
| WE9110 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Pulse Telephone Dialer |
| WE9140 | 制造商:WINBOND 制造商全稱:Winbond 功能描述:TONE/PULSE SWITCHABLE DIALER WITH REDIAL |
| WE9140A | 制造商:WINBOND 制造商全稱:Winbond 功能描述:TONE/PULSE SWITCHABLE DIALER WITH REDIAL |
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