Amplifiers – Modulator-demodulator-type amplifier
Patent
1997-07-30
1999-05-18
Lee, Benny
Amplifiers
Modulator-demodulator-type amplifier
330207A, 455126, H03F3/38
Patent
active
059054077
ABSTRACT:
An amplifier (100) includes an output node (114) having an output voltage (V.sub.out), and a switching amplifier (104) having a first output (132) coupled to the output node for delivering a switching amplifier output current (I.sub.SW) to the output node. The amplifier further includes a modulator (136) coupled to the switching amplifier for controlling the switching amplifier, and a linear amplifier (102) producing a linear amplifier output current (I.sub.lin) through a second output (118) coupled to the output node. The amplifier also includes a feedback network (106) coupled to the modulator for controlling the modulator, the feedback network also coupled to a reference signal (V.sub.ref) which the amplifier apparatus tracks, the feedback network further coupled to a current sense signal (I.sub.sen) proportional to the linear amplifier output current, and coupled to a switching amplifier signal (V.sub.int) internal to the switching amplifier, the switching amplifier signal not derived from the output voltage and not generated by sensing the switching amplifier output current.
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Pallab Midya and Philip T. Krein, "Feed-forward active filter for output ripple cancellation", pp. 1-14, 1994, USA.
Pallab Midya, Matthew Greuel, and Philip T. Krein, "Sensorless Current Mode Control-An Observer-Based Technique for Dc-Dc Converters", IEEE Power Electronics Specialists Conference Record, pp. 197-202, Jun. 22, 1997, USA .
Breeden R. Louis
Lee Benny
Motorola Inc.
Nguyen Khanh V.
LandOfFree
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