Logarithmic amplifier with self-compensating gain for frequency

Details Logarithmic amplifier with self-compensating gain for frequency Logarithmic amplifier with self-compensating gain for frequency

1999-01-29

2000-11-07

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Specific input to output function

Logarithmic

327 67, H03G 1108

Patent

active

061442445

ABSTRACT:
A progressive-compression logarithmic amplifier, amplifier stage, and method for increasing the bandwidth of a differential-input progressive-compression logarithmic amplifier are disclosed. The amplifier stage provides positive gain increases for decreases in the impedance of the load driven by the stage. When multiple amplifier stages of this type are cascaded, the gain increase in each stage compensates for high-frequency roll-off due to the input capacitance of the following stage. The compensating is activated by the roll-off effect itself, making the device self-compensating. This is preferably accomplished by providing a drive current sensing path that makes each node of the stage's differential output respond in opposition to the drive current drawn at the stage's other differential output--that is, an increase in drive current at one output node drops the voltage at the other output node.

REFERENCES:
patent: 5063311 (1991-11-01), Swapp
patent: 5329173 (1994-07-01), Murakami et al.
patent: 5489868 (1996-02-01), Gilbert
patent: 5818279 (1998-10-01), Dick
Analog Devices Product Guide; Low Cost DC-500 MHz, 92 dB Logarithmic Amplifier "AD8307", Rev. 0; Norwood, MA; 1997 (pp. 1-20).

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