Transmitter with low-level modulation and minimal harmonic emissions
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Oct 12, 1999
Grant Date -
N/A
app pub date -
Jun 3, 1997
filing date -
Jun 3, 1997
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An AM radio transmitter utilizes a push-pull MOSFET based design that rejects even-ordered harmonics, and therefore produces minimal electromagnetic radiation. The transmitter contains a low level modulating circuit and a feedback modulation arrangement which linearizes the modulation of the transmitter, and also senses reverse power in the transmitter antenna line, so that the power and modulation can be reduced if the transmitter has a less than optimal load condition existing on an antenna port. A unique modulation amplifier utilizes a Darlington RF pair having an input stage including the collector of the first transistor of the pair, and a pin diode connected to the base of the first transistor of the pair. A radio signal is modulated by varying a voltage on the collector of the input stage, and simultaneously maintaining a constant voltage at an output stage of the Darlington RF transistor pair. Additionally, a bias of the pin diode is simultaneously varied by the audio signal, thereby changing attenuation characteristics of the radio signal.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully