Doubled balanced differential amplifier circuit with low power consumption for FM modulation or demodulation

Claim 1

A switching apparatus comprising: (a) first and second power source terminals; (b) first and second switching signal generators; (c) first and second loads; (d) switching means for selectively coupling said first and second generators and said first and second loads between said power source terminals in response to first and second control signals, said switching means including a first pair of transistors having current paths connected to selectively couple said first and second loads in series with said first and second signal generators, respectively, in response to said first control signal, and said switching means including a second pair of transistors having current paths connected to selectively couple said first and second loads in series with said second and first signal generators, respectively, in response to said second control signal; and (e) means for generating said first and second control signals, with said first and second control signals rendering at least said current paths of one of said first and second pairs of transistors fully conductive prior to termination of conductivity of the current paths of either said first or second pair of transistors.