Means and method of enhancing signal resolution and dynamic rang

Details Means and method of enhancing signal resolution and dynamic rang Means and method of enhancing signal resolution and dynamic rang

1994-05-31

1995-06-06

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330207A, 330295, 330146, H03F 338

Patent

active

054225973

ABSTRACT:
An amplifier (1) used with a pulse width modulated signal which improves the efficiency of a low level input signal comprises two or more switching devices (7,9) with common source/drain or emitter/collector connections. The gates or the bases of the devices are independently driven to optimize the efficiency of the various Rds (on) resistance values of the transistors (61, 63, 65, 89, 91, 93) used in the devices. The amplifier is operated so that during the highest output levels, select switching devices (61, 63, 65) are utilized to reduce in series resistance with the load (13). As output power decreases, devices (89, 91, 93) with higher Rds (on) resistance values are activated by a control signal which greatly improves DC to DC conversion efficiency with improved output voltage resolution, dynamic range and reduced electromagnetic interference potential.

REFERENCES:
patent: 4446440 (1984-05-01), Bell

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