Pulse quadrature modulator and method

a quadrature modulator and power stage technology, applied in the direction of electrical equipment, digital transmission, multiple carrier systems, etc., can solve the problems of high cost of heat elimination, low power consumption, direct or indirect power consumption, etc., to improve the speed of digital circuits, linearity and power conversion of switching rf power stages are superior

Active Publication Date: 2018-06-28
ADX RES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009]Linearity and power conversion of a switching RF power stage are superior to that of a conventional RF lineup to create a modulated RF signal. As semiconductor processes improve the speed of digital circuits and switching circuits more RF systems can be implemented using this invention.

Problems solved by technology

Power consumption, directly or indirectly, contributes to a large portion of the cost of RF transmission.
Even when the cost of the power consumed is low there is significant cost associated with elimination of the heat from a linear RF amplifier.
Further, the speed of digital circuits continues to go up and their cost continues to go down.

Method used

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  • Pulse quadrature modulator and method
  • Pulse quadrature modulator and method
  • Pulse quadrature modulator and method

Examples

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Embodiment Construction

[0030]FIG. 1 illustrates a block diagram of the system of a switching RF power stage modulator driving dipole antenna 100. A pulse quadrature modulator 102 takes inputs digital baseband I 101 and Q 103 and a high speed quantization clock 109 and generates two outputs alpha 105 and beta 107. Alpha 105 and beta 107 are binary signal of one serial bit switched at the RF carrier frequency for driving the pair of switches. Note that the alpha signal and the beta signal switch at different times. There is an up transition and a down transition for both signals in a period of the RF carrier frequency. Thus there is a single transition at four times the RF carrier frequency. In other words there is an alpha pulse edge nominally occurring at a rate two times the RF carrier frequency and a beta pulse edge nominally occurring at a rate two times the RF carrier frequency. The RF carrier frequency period is divided into four equal quarters and alpha or beta transitions every quarter of the perio...

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Abstract

A pulse quadrature modulator generates both alpha and beta binary signals, each one serial bit switched at an RF carrier frequency at a fraction of a high speed quantization clock. The alpha and beta binary signals each have respective alpha and beta pulse edges nominally occurring at two times the RF carrier frequency. The alpha and beta pulse edges alternate respectively. The alpha and beta pulse edges are each synchronized to the high speed quantization clock switched based on the baseband I and Q signal inputs. First and second switches gate a power signal using a respective of the alpha or beta binary signals to respectively produce first and second power outputs. The first and second switches differentially drive an RF load such as an antenna across the first and second power outputs having pulse edges at nominally at an integer multiple of four times the RF carrier frequency.

Description

BACKGROUND OF THE INVENTIONS1. Technical Field[0001]The present inventions relate to a quadrature modulated bridge switching power stage that produces a modulated RF signal and, more particularly, relate to a pulse modulated bridge power stage for creating a quadrature modulated RF signal for RF transmission.2. Description of the Related Art[0002]Quadrature modulation is a method of transmitting a complex baseband signal using a single RF (radio frequency) frequency and an RF power amplifier. The power conversion efficiency of the RF power amplifier is a function of the RF signal envelope peak to average ratio. The power conversion efficiency can be as low as 10% for large peak to average ratio (10 dB). Even for an FM signal which is constant envelope with a peak to average ratio of 0 dB the power conversion efficiency is only about 50%. The remaining power is lost as heat and results in higher power consumption as well as cost and size of a system to eliminate the heat. There is al...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04L27/36
CPCH04L27/362H04B1/00
Inventor MIDYA, PALLABLINDEMANN, BRIAN DRIBE, JOHN
Owner ADX RES
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