參數(shù)資料
型號(hào): 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(yè)數(shù): 22/32頁(yè)
文件大?。?/td> 334K
代理商: TK14551V
Page 22
January 2000 TOKO, Inc.
TK14551V
CIRCUIT DESCRIPTION
RSSI-OUT (V)
RF INPUT - LEVEL (dBu)
AM can be
demodulated
inside of linear
range
Operating Condition:
V
= 3 V, fin = 40 MHz,
fm = 2 MHz, Mod =
±
80%,
V
IN
= -40 dBm
50 mV/div
0.2
μ
s/div
FIGURE 4 -AM DEMODULATED WAVEFORM
If it is necessary to improve the distortion of the AM demodulated waveform of logarithmic detection, connect a low pass
filter to the RSSI buffer amplifier output. Figure 5 shows the AM demodulated waveform with a low pass filter inserted.
3 k
2.2 k
10 pF
1 k
COMP VCC
15 pF
2.2 k
3 k
33 pF
fc = 3 MHz
C
TEST CIRCUIT
Operating Condition:
V
= 3 V, fin = 40 MHz,
fm = 2 MHz, Mod =
±
80%,
V
IN
= -40 dBm
50 mV/div
0.2
μ
s/div
FIGURE 5
Figure 4 shows the AM demodulated waveform.
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