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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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HT9015 датащи(PDF) 16 Page - Holtek Semiconductor Inc |
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HT9015 датащи(HTML) 16 Page - Holtek Semiconductor Inc |
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16 / 23 page  HT9015 16 April 10, 2000 Preliminary · Limiting IF Amplifier, RSSI (Received Signal Strength Indicator) and RSSI Comparator The basic function of the IF amp is to boost the IF signal and to help handle impulse noise. The IF limiter applies very high gain to the IF frequency such that the top and bottom of the waveform are clipped. This helps in re- ducing AM and noise intercepted upon recep- tion. The limiting IF amplifier consists of four differential amplifiers (Figure 6). · Quadrature detector Once the signal leaves the IF section, it must be demodulated so that the baseband signal can be separated from the IF signal. This is accomplished by the quadrature detector. A quadrature detector (Figure 7) uses a 90° phase shifter (Ci), an L/C tuned circuit, and a phase comparator to demodulate FM signals. 2nd I F AM P1 AM P2 AM P3 AM P4 DE C OF - I N Q u a d ra t u re De t e c t o r S (R S S I ) I n t e r nal LC - T ank IF - O U T Figure 6 Limiting IF Amplifier, RSSI and RSSI comparator V DD IF _ A M P B u ffe r V i I= I 1 +I 2 ¯ D i f f er ent i a l t o S i n g l e - E nded C o n v er t e r LP F D e m o dul at i o n S i g nal f 0 = 47k H z I L1 ¯ I L2 ¯ I 1 ¯ C i LC R LC - T ank V O ¯ I 2 ¯ Figure 7 Quadrature detector |
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