TK14584 Просмотр технического описания (PDF) - Toko America Inc
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TK14584 Datasheet PDF : 20 Pages
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CIRCUIT DESCRIPTION (CONT.)
TK14584
Operating Condition
VCC = 3 V, fIN = 10.7 MHz,
fm = 40 kHz, Mod = 80%,
V = -40 dBm
IN
100mV/div
10µs/div
RSSI-OUT (V)
AM can be
demodulated
inside of linear
range
FIGURE 3A - AM DEMODULATED WAVEFORM
RF INPUT - LEVEL (dBu)
FIGURE 3B
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 10 (IF limiter output) and Pin 9 (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.
VCC
VCC
QA
VCC
QB
multiplier core circuit
FIGURE 4
January 2000 TOKO, Inc.
Page 15
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