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| 型号： | MC1311 |
| 厂商： | Motorola, Inc. |
| 英文描述： | UNIVERSAL NARROWBAND FM RECEIVER INTEGRATED CIRCUIT |
| 中文描述： | 通用窄带调频接收器集成电路 |
| 文件页数： | 20/68页 |
| 文件大小： | 1316K |
| 代理商： | MC1311 |
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MC13110A/B MC13111A/B
FIRST AND SECOND MIXER
20
MOTOROLA ANALOG IC DEVICE DATA
Mixer Description
The 1st and 2nd mixers are similar in design. Both are
double balanced to suppress the LO and the input
frequencies to give only the sum and difference frequencies
at the mixer output. Typically the LO is suppressed better
than –50 dB for the first mixer and better than –40 dB for the
second mixer. The gain of the 1st mixer has a –3.0 dB corner
at approximately 13 MHz and is used at a 10.7 MHz IF. It has
an output impedance of 300
and matches to a typical
10.7 MHz ceramic filter with a source and load impedance of
330
. A series resistor may be used to raise the impedance
for use with crystal filters. They typically have an input
impedance much greater than 330
.
First Mixer
Figures 17 through 20 show the first mixer transfer curves
for the voltage conversion gain, output level, and
intermodulation. Notice that there is approximately 10 dB
linearity improvement when the “IP3 Increase” bit is set to
<1>. The “IP3 Increase” bit is a programmable bit as shown in
the Serial Programmable Interface section under the Rx
Counter Latch Register. The IP3 = <1> option will increase
the supply current demand by 1.3 mA.
Figure 13. First Mixer Input and Output Impedance
Schematic
1st Mixer
Mix1 In
Mix1 Out
RPI
CPI
RPO
CPO
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Figure 14. First Mixer Output Impedance
Unit
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Output Impedance
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B IP3 = <0> (Set Low)
304
// 3.7 pF
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B IP3 = <1> (Set High)
300
// 4.0 pF
Figures 13, 14, and 16 represent the input and output
impedance for the first mixer. Notice that the input
single–ended and differential impedances are basically the
same. The output impedance as described in Figure 14 will
be used to match to a ceramic or crystal filter’s input
impedance. A typical ceramic filter input impedance is 330
while crystal filter input impedance is usually 1500
. Exact
impedance matching to ceramic filters are not critical,
however, more attention needs to be given to the filter
characteristics of a crystal filter. Crystal filters are much
narrower. It is important to accurately match to these filters to
guaranty a reasonable response.
To find the IF bandwidth response of the first mixer refer to
Figure 22. The –3.0 dB bandwidth point is approximately 13
MHz. Figure 15 is a summary of the first mixer feedthrough
parameters.
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Note:
相关PDF资料 |
PDF描述 |
|---|---|
| MC13110AFB | UNIVERSAL NARROWBAND FM RECEIVER INTEGRATED CIRCUIT |
| MC13110AFTA | UNIVERSAL NARROWBAND FM RECEIVER INTEGRATED CIRCUIT |
| MC13110BFB | UNIVERSAL NARROWBAND FM RECEIVER INTEGRATED CIRCUIT |
| MC13111AFB | UNIVERSAL NARROWBAND FM RECEIVER INTEGRATED CIRCUIT |
| MC13110BFTA | UNIVERSAL NARROWBAND FM RECEIVER INTEGRATED CIRCUIT |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MC13110 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:UNIVERSAL NARROWBAND FM RECEIVER INTEGRATED CIRCUIT |
| MC13110A | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:UNIVERSAL CORDLESS TELEPHONE SUBSYSTEM IC |
| MC13110AFB | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:UNIVERSAL CORDLESS TELEPHONE SUBSYSTEM IC |
| MC13110AFTA | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:UNIVERSAL NARROWBAND FM RECEIVER INTEGRATED CIRCUIT |
| MC13110BFB | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:UNIVERSAL NARROWBAND FM RECEIVER INTEGRATED CIRCUIT |
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