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參數(shù)資料
| 型號： | 935166750118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通信及網(wǎng)絡 |
| 英文描述： | SPECIALTY TELECOM CIRCUIT, PDSO20 |
| 封裝： | PLASTIC, SOT-266-1, SSOP-20 |
| 文件頁數(shù)： | 7/20頁 |
| 文件大?。?/td> | 239K |
| 代理商： | 935166750118 |
Philips Semiconductors
Product specification
SA636
Low voltage high performance mixer FM IF system
with high-speed RSSI
1997 Nov 07
15
CIRCUIT DESCRIPTION
The SA636 is an IF signal processing system suitable for second IF
or single conversion systems with input frequency as high as 1GHz.
The bandwidth of the IF amplifier is about 40MHz, with 38dB of gain
from a 50
source. The bandwidth of the limiter is about 28MHz
with about 54dB of gain from a 50
source. However, the
gain/bandwidth distribution is optimized for 10.7MHz, 330
source
applications. The overall system is well-suited to battery operation
as well as high performance and high quality products of all types,
such as cordless and cellular hand-held phones.
The input stage is a Gilbert cell mixer with oscillator. Typical mixer
characteristics include a noise figure of 14dB, conversion gain of
11dB, and input third-order intercept of -16dBm. The oscillator will
operate in excess of 1GHz in L/C tank configurations. Hartley or
Colpitts circuits can be used up to 100MHz for xtal configurations.
Butler oscillators are recommended for xtal configurations up to
150MHz.
The output of the mixer is internally loaded with a 330
resistor
permitting direct connection to a 10.7MHz ceramic filter for
narrowband applications. The input resistance of the limiting IF
amplifiers is also 330
. With most 10.7MHz ceramic filters and
many crystal filters, no impedance matching network is necessary.
For applications requiring wideband IF filtering, such as DECT,
external LC filters are used (see Figure 10). To achieve optimum
linearity of the log signal strength indicator, there must be a 6dB(v)
insertion loss between the first and second IF stages. If the IF filter
or interstage network does not cause 6dB(v) insertion loss, a fixed
or variable resistor can be added between the first IF output (Pin 16)
and the interstage network.
The signal from the second limiting amplifier goes to a Gilbert cell
quadrature detector. One port of the Gilbert cell is internally driven
by the IF. The other output of the IF is AC-coupled to a tuned
quadrature network. This signal, which now has a 90
° phase
relationship to the internal signal, drives the other port of the
multiplier cell.
Overall, the IF section has a gain of 90dB. For operation at
intermediate frequency at 10.7MHz. Special care must be given to
layout, termination, and interstage loss to avoid instability.
The demodulated output (DATA) of the quadrature is a voltage
output. This output is designed to handle a minimum bandwidth of
600kHz. This is designed to demodulate wideband data, such as in
DECT applications.
A Receive Signal Strength Indicator (RSSI) completes the circuitry.
The output range is greater than 90dB and is temperature
compensated. This log signal strength indicator exceeds the criteria
for AMPS or TACS cellular telephone, DECT and RCR-28 cordless
telephone. This signal drives an internal op amp. The op amp is
capable of rail-to-rail output. It can be used for gain, filtering, or
2nd-order temperature compensation of the RSSI, if needed.
NOTE: dB(v) = 20log VOUT/VIN
相關PDF資料 |
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| 0673.250 | Circular Connector; Body Material:Aluminum; Series:PT06; No. of Contacts:3; Connector Shell Size:8; Connecting Termination:Solder; Circular Shell Style:Straight Plug; Circular Contact Gender:Socket; Insert Arrangement:8-3 |
| 0673.300 | Circular Connector; MIL SPEC:MIL-C-26482, Series I, Solder; Body Material:Aluminum; Series:PT06; Number of Contacts:4; Connector Shell Size:8; Connecting Termination:Solder; Circular Shell Style:Straight Plug; Body Style:Straight |
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