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參數(shù)資料
| 型號： | TK14551V |
| 廠商： | TOKO INC |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | FM IF DETECTOR/AMPLIFIER |
| 中文描述： | SPECIALTY TELECOM CIRCUIT, PDSO24 |
| 封裝： | TSSOP-24 |
| 文件頁數(shù)： | 23/32頁 |
| 文件大?。?/td> | 334K |
| 代理商： | TK14551V |
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January 2000 TOKO, Inc.
Page 23
TK14551V
VCC
VCC
QB
VCC
QA
multiplier core circuit
FIGURE 6 - DETECTOR INTERNAL EQUIVALENT CIRCUIT
VCC
VCC
Delay
Line
VCC
Rz
Rz
Rz is the characteristic impedance
LC resonance circuit
ceramic discriminator
delay line
FIGURE 7 - EXAMPLES OF PHASE SHIFTERS
CIRCUIT DESCRIPTION
FM Detector:
The FM detector is included in the quadrature FM detector using a Gilbert multiplier.
It is suitable for high speed data communication because the demodulation bandwidth is over 1 MHz.
The phase shifter is connected between Pin 3 (IF limiter output) and Pin 4 (input detector). Any available phase shifter
can be used: a LC resonance circuit, a ceramic discriminator, a delay line, etc.
Figure 6 shows the internal equivalent circuit of the detector.
The signal from the phase shifter is applied to the multiplier (in the dotted line) through emitter-follower stage QA. When
the phase shifter is connected between pin 3 and pin 4, note that the bias voltage to pin 4 should be provided from an
external source because pin 4 is only connected to the base of QA.
Because the base of QB (at the opposite side) is connected with the supply voltage, Pin 4 has to be biased with the
equivalent voltage.
Using an LC resonance circuit is not a problem (see Figure 7). However, when using a ceramic discriminator, it is
necessary to pay attention to bias. If there is a difference of the base voltages, the DC voltages of the multiplier do not
balance. It alters the DC zero point or worsens the distortion of demodulation output.
The Pin 4 input level should be saturated at the multiplier; if this level is lower, it is easy to disperse the modulation output.
Therefore, to have stable operation, Pin 4 should be higher than 100 mV
P-P
.
The following figures show examples of the phase shifter.
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| TK14551VTL | FM IF DETECTOR/AMPLIFIER |
| TK14552V | Wide band AM / ASK IF IC for ETC |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TK14551V/14551 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:FM IF DETECTOR/AMPLIFIER |
| TK14551VTL | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:FM IF DETECTOR/AMPLIFIER |
| TK14552V | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:Wide band AM / ASK IF IC for ETC |
| TK14583V-G | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:Wide band FM IF IC for remote keyless entry / tire pressure monitoring system |
| TK14583VTL-G | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:Wide band FM IF IC for remote keyless entry / tire pressure monitoring system |
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