Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Patent
1985-07-02
1986-12-30
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
329132, 329168, 329178, 330280, 330281, 455244, 455245, 455246, H04B 116, H03G 320
Patent
active
046335188
ABSTRACT:
An AGC voltage generating circuit for an AM radio comprises a product detector adapted to receive an IF signal modulated by an AF signal and synchronously detect the AF signal, a low pass filter adapted to derive from the product detector a filtered voltage indicating the average IF signal strength, and a reference voltage generating circuit ratiometrically related to the low pass filter through a common DC power supply and effective to generate high, medium and low reference voltages ratiometrically related to each other with the high and low reference voltages defining a voltage window about the medium reference voltage. Comparator apparatus is effective to compare the filtered voltage from the low pass filter with the high, medium and low reference voltages from the reference voltage generating circuit. Current source apparatus is responsive to the comparator apparatus to control the voltage on a capacitor to maintain the filtered voltage equal to the medium reference voltage. The current source apparatus is further responsive to the comparator apparatus to increase the rate of voltage change across the capacitor when the filtered voltage is outside the voltage window compared to the rate when the filtered voltage is within the voltage window. The AGC voltage is derived from the voltage on the capacitor.
REFERENCES:
patent: 3310745 (1967-03-01), Deasy
patent: 4013964 (1977-03-01), Skutta
patent: 4030035 (1977-06-01), Ienaka et al.
patent: 4371842 (1983-02-01), Lee
patent: 4404431 (1983-09-01), Watanabe
patent: 4424494 (1984-01-01), Aldridge et al.
patent: 4471311 (1984-09-01), Hirata
Aldridge Fredrick A.
Kennedy Richard A.
Bookbinder Marc E.
General Motors Corporation
Sigler Robert M.
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