Linear-in-decibel current generators

Details Linear-in-decibel current generators Linear-in-decibel current generators

2006-08-16

2008-03-18

Zweizig, Jeffrey (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

With specific source of supply or bias voltage

Reexamination Certificate

active

07345526

ABSTRACT:
Linear-in-dB current generators having a maximum gain with least gain error. A first transistor is coupled between a first node and a first power voltage, and a first resistor is coupled between the first transistor and a second node. A second transistor is coupled between the second node and a second power voltage and comprises a control terminal coupled to the first node, and a third transistor comprises a first terminal coupled to the second power voltage, and a control terminal coupled to the first node. A second resistor is coupled between the third transistor and a third node, and a fourth transistor comprises a first terminal coupled to the first terminal, and a control terminal coupled to the third node. A first current source and the second current source are coupled to the second node and the third node respectively, and a reference current source is coupled to the first node.

REFERENCES:
patent: 5572166 (1996-11-01), Gilbert
patent: 6958656 (2005-10-01), Yamashita et al.
Lecture script from “Advanced Integrated Circuits for Communications”, Meyer, Jan. 30, 2004.

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