Power Amplifier Output Power Control Circuit
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
N/A
Issued Date -
N/A
app pub date -
Dec 25, 2017
filing date -
Dec 30, 2013
priority date (Note) -
Granted
status (Latency Note)
Importance
Abstract
A power amplifier output power control circuit includes a first operational amplifier with a negative input terminal configured to receive a power control signal; a first PMOS transistor with a grid electrode connected to an output terminal of the first operational amplifier, a source electrode connected to an external power source, and a drain electrode grounded via a voltage dividing network; a power amplifier with a power end connected to the drain electrode of the first PMOS transistor, an input terminal configured to access to a signal to be amplified, and an output terminal configured to amplify the signal; and a current sampling circuit configured to produce sampling current after sampling current across the first PMOS transistor and providing a negative feedback signal for the positive input terminal of the first operational amplifier according to the sampling current such that total output power of the power amplifier keeps unchanged.
First Claim
Other Claims data not available
