Bipolar differential to single ended transfer circuit with...

Details Bipolar differential to single ended transfer circuit with... Bipolar differential to single ended transfer circuit with...

2006-09-19

2006-09-19

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including balanced to unbalanced circuits and vice versa

C330S257000, C330S260000

Reexamination Certificate

active

07109802

ABSTRACT:
A differential to single-ended signal transfer circuit that allows increased gain and improved AC performance while reducing power supply voltage requirements. The transfer circuit includes a first operational transconductance amplifier (OTA), a second operational amplifier (OPA), first and second controlled current sources, a third current source, and first and second bipolar junction transistors. The inverting and non-inverting inputs of the transfer circuit are provided at the inverting input and the non-inverting input, respectively, of the OTA, which is coupled to the first and second controlled current sources to form a current mirror with tracking feedback. The output voltage of the transfer circuit is provided at the emitter of the first transistor, the base of which is connected to the non-inverting input INp. The first transistor is coupled to the third current source in an emitter follower configuration to provide both current gain and impedance matching. The base of the second transistor is connected to the inverting input of the transfer circuit. The OPA is coupled between the respective emitters of the first and second transistors in a voltage follower configuration.

REFERENCES:
patent: 6127891 (2000-10-01), Eschauzier et al.
patent: 6150833 (2000-11-01), Lin et al.
patent: 6825721 (2004-11-01), Sanchez et al.

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