- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄361482 > TK14588 (TOKO Inc.) FM IF IC PDF資料下載
參數(shù)資料
| 型號： | TK14588 |
| 廠商： | TOKO Inc. |
| 英文描述： | FM IF IC |
| 中文描述： | 調(diào)頻中頻集成電路 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大?。?/td> | 233K |
| 代理商： | TK14588 |
January 2000 TOKO, Inc.
Page 15
TK14588
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 14 (IF limiter output) and Pin 13 (input detector). Any available phase shifter
can be used: a LC resonance circuit, a ceramic discriminator, a delay line, etc.
Figure 4 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 14 and Pin 13, note that the bias voltage to Pin 13 should be provided from
an external source because Pin 13 is only connected to the base of QA.
Because the base of QB (at the opposite side) is connected with the supply voltage, Pin 13 has to be biased with the
equivalent voltage.
Using an LC resonance circuit is not a problem (see Figure 5). 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 13 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 13 should be higher than 100 mV
P-P
.
The following figures show examples of the phase shifter.
CIRCUIT DESCRIPTION (CONT.)
VCC
VCC
QB
VCC
QA
multiplier core circuit
FIGURE 4
VCC
VCC
Delay
Line
VCC
Rz
Rz
Rz is the characteristic impedance
LC resonance circuit
ceramic discriminator
delay line
FIGURE 5 - EXAMPLES OF PHASE SHIFTER
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TK14588V | FM IF IC |
| TK14588VTL | FM IF IC |
| TK15121MTL | Grand Earthing System Audio Signal Mute IC |
| TK15121 | Grand Earthing System Audio Signal Mute IC |
| TK15121M | Grand Earthing System Audio Signal Mute IC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TK14588V | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:FM IF IC |
| TK14588V/14588 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:FM IF IC |
| TK14588VTL | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:FM IF IC |
| TK145J | 制造商:Panasonic Electric Works 功能描述: |
| TK14600 | 制造商:TOKO 制造商全稱:TOKO, Inc 功能描述:NARROW BAND FM IF AMPLIFIER |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。