Circuit for a high impedance signal source

Details Circuit for a high impedance signal source Circuit for a high impedance signal source

H - Electricity

03

F

179/36, 330/43

H03F 1/26 (2006.01) H03F 1/30 (2006.01) H03F 3/16 (2006.01) H03F 3/185 (2006.01)

Patent

CA 1199985

- 18 - A CIRCUIT FOR A HIGH IMPEDANCE SIGNAL SOURCE Abstract An integrated circuit amplifier for a high impedance microphone of the capacitance type is disclosed. The subject amplifier circuit permits the further miniaturization of an electret microphone as it is capable of providing an input impedance simulating a resistor value of hundreds of megohms. The circuit particularly comprises duplicate coupling circuits, a source of reference direct current voltage, and a gain providing circuit. The coupling circuits comprise a first pair of diodes symmetrically placed about one input terminal of the microphone. Outputs of the reference voltage source are provided to coupling circuits and through the coupling circuits to gain providing circuit 102. Such an arrangement facilitates power supply noise rejection and automatic canceling of direct current voltage drifts. A current repeater circuit is employed generally throughout the integrated circuit amplifier for driving various elements. The current repeater comprises at least one unipolar transistor to permit operation at low direct current voltages, while providing an accurately controlled current transfer ratio.

425611

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