TV Tuner circuit

Details TV Tuner circuit TV Tuner circuit

1982-01-07

1984-03-20

Ng, Jin F.

Telecommunications

Receiver or analog modulated signal frequency converter

Signal selection based on frequency

455200, 455176, H04B 116

Patent

active

044385293

ABSTRACT:
A TV tuner circuit having a dual-gate MES FET in a UHF RF amplifier and a dual-gate MOS FET in a VHF RF amplifier which are both controlled by a single AGC voltage source. The source of the MES FET is always connected to a DC source voltage input through a resistor so as to ensure that no DC current flows from an AG voltage source to the second gate of the dual-gate MPES FET in receiving VHF signals. Accordingly, there is no drop in the AGC voltage applied to the second gate of the dual-gate MOS FET in the VHF RF amplifier, thereby enabling both the UHF RF amplifier and the VHF RF amplifier to have the same gain reduction characteristics.

REFERENCES:
patent: 4048598 (1977-09-01), Knight
patent: 4162452 (1979-07-01), Ash

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