Method and apparatus for direct digital to radio frequency conversion
AssigneeMotorola, Inc.
InventorsLawrence F. Cygan, Curtis M. Williams, Andrew M. Khan
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Abstract
A method and apparatus for direct conversion of digital data to high power RF signals, known as DDRF. The method and apparatus receive a digital signal, create a digital modulated signal therefrom, and amplify the modulated signal with an H-bridge Power Amplifier for transmission. DDRF uses a multi-level H-bridge amplification circuit to establish a more power efficient digital transmitter.
Claims25
A digital to radio frequency amplifier system comprising:
- a bandpass delta sigma modulator for receiving a modulated carrier input and for producing a multilevel modulation signal;
- a level select logic mapper connected to receive said multilevel modulation signal, said level select logic mapper provides a plurality of drive signals;
- and
- an H-bridge amplifier connected to said plurality of drive signals of said level select logic mapper wherein said H-bridge amplifier is driven by said level select logic mapper.
A method of directly converting a digital signal to a radio frequency and relaying the radio frequency, the method comprising:
- receiving a modulated signal;
- creating a multi-level modulated signal based on the received modulated signal;
- mapping to an H-bridge power amplifier, the multi-level modulated signal through a level select logic mapper;
- and
- providing an amplified digital-RF signal to a load.
A Direct Digital to Radio Frequency (DDRF) system comprising:
- a bandpass delta sigma modulator for receiving a modulated carrier input and for producing a multilevel modulation signal, wherein said multi-level modulation signal further comprises a zero state;
- a level select logic mapper connected to receive said multilevel modulation signal, said level select logic mapper provides a plurality of drive signals;
- and
- an H-bridge amplifier connected to said plurality of drive signals of said level select logic mapper wherein said H-bridge amplifier is driven by said level select logic mapper.
An H-Bridge Amplifier with a floating drive source for use in a DDRF system, said H-Bridge Amplifier comprising:
- a first FET connected between a first power source terminal and a first node;
- a second FET connected between a second power source terminal and said first node;
- a third FET connected between said first power source terminal and a second node;
- a fourth FET connected between said second power source terminal and said second node;
- a load connected on a first end through a first band-pass filter to said first node and said load connected on a second end through a second band-pass filter to said second node;
- a floating drive source, said floating drive source comprising a plurality of drivers, wherein an output of a first driver of said plurality of drivers is connected to an input of said first FET, an output of a second driver of said plurality of drivers is connected to an input of said second FET, an output of a third driver of said plurality of drivers is connected to an input of said third FET, and an output of a fourth driver of said plurality of drivers is connected to an input of said fourth FET;
- and
- wherein said first power source terminal is adaptively connected to a first power source and said second power source terminal is adaptively connected to a second power source.
Dependencies are inferred from the claim text.