H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/3
H04N 7/00 (2006.01) H03F 3/72 (2006.01) H03K 17/693 (2006.01) H03K 17/74 (2006.01) H03K 17/76 (2006.01)
Patent
CA 2027979
Switches are cascaded for improved off-state attenuation. The first switch of the cascade comprises an L-type attenuator with series branch including a resistor and a shunt branch including a Zener diode. A bias network coupled to the attenuator and to the second switch of the cascade connection controls the diode bias for operation at a specific forward conduction when the second switch is open and for operation at a specific reverse bias condition when the second switch is closed for causing the attenuator to provide the plural functions of ( 1 ) enhancing the switch off-state attenuation, (2) providing over-voltage and overcurrent protection for input transients of either polarity and (3) providing a predetermined output DC level when the second switch is on for establishing the DC bias of a subsequent circuit, such as an amplifier, the DC bias so supplied being in a tracking relationship with DC power supplied to the subsequent circuit.
Craig Wilson And Company
Thomson Consumer Electronics Inc.
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