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1. 发明专利

CA2237633A1 DIGITAL SIGNAL PROCESSING FOR LINEARIZATION OF SMALL INPUT SIGNALS TO A TRI-STATE POWER SWITCH 未知
公开(公告)号：CA2237633A1
公开(公告)日：1997-05-22
申请号：CA2237633
申请日：1996-10-31
申请人： APOGEE TECHNOLOGY INC
发明人： ADRIAN ANDREW ARMEN , SPIEGEL LEO , MEYERS DAVID BARRETT , DANIELSON MICHAEL STEPHEN
IPC分类号： H03F1/32 , H03F3/217 , H03F3/38
摘要： An all digital switching amplifier includes an input over-sampling filter (2 0) for receiving a pulse code modulated (PCM) digital input signal. Oversampled PCM data are supplied to a multibit noise shaper (22), which frequency shape s quantization error. The oversampled, noise-shaped, PCM data is applied to an amplitude-to-time converter (24), which produces variable-width command pulses. The command pulses from converter (24) are applied to switch drive logic circuit (28) to enable switches (26) to connect a filter (30) and load (32) to power supply (34).

2. 发明专利

AU7605196A Small signal linearization in power switching amplifiers 未知
公开(公告)号：AU7605196A
公开(公告)日：1997-06-05
申请号：AU7605196
申请日：1996-10-31
申请人： APOGEE TECHNOLOGY INC
发明人： ADRIAN ANDREW ARMEN , DANIELSON MICHAEL STEPHEN , MEYERS DAVID BARRETT , SPIEGEL LEO
IPC分类号： H03F1/32 , H03F3/217 , H03F3/38
摘要： An all digital switching amplifier wherein linearization of the power switch is accomplished solely by using three states. A small, fixed width, bi-state compensating carrier waveform is added to the leading or training edges of an oversampled main input pulse producing a compensated composite waveform. This compensating carrier linearizes output from a power switch by effecting common mode cancellation of switch time errors. Output pulse width combinations for the compensating carrier are obtained from a look-up table stored in memory. A correction mechanism is implemented to correct for harmonic distortion that is dependent on the modulation level or index and results from the compensating carrier modulation. The correction mechanism applies the inverse of the modulation induced distortion to the oversampled compensated composite input signal to null distortion products resulting from the modulation scheme used to apply the small carrier to linearize the performance of the tri-state power switch. Digital timing control of the power switch's deadband ensures accuracy of the timing and sequence in which individual switches within the power switch H-bridge are turned off and turned on, so as to preclude a short circuit across the power supply. A high speed clock used in linearizing the power switch provides a timing reference to generate the necessary deadband timing delays and pulse width increments. The output bridge uses enhancement mode MOSFETs.

3. 发明专利

CA2237633C DIGITAL SIGNAL PROCESSING FOR LINEARIZATION OF SMALL INPUT SIGNALS TO A TRI-STATE POWER SWITCH 未知
公开(公告)号：CA2237633C
公开(公告)日：2003-01-21
申请号：CA2237633
申请日：1996-10-31
申请人： APOGEE TECHNOLOGY INC
发明人： ADRIAN ANDREW ARMEN , SPIEGEL LEO , MEYERS DAVID BARRETT , DANIELSON MICHAEL STEPHEN
IPC分类号： H03F1/32 , H03F3/217 , H03F3/38
摘要： An all digital switching amplifier includes an input over-sampling filter (2 0) for receiving a pulse code modulated (PCM) digital input signal. Oversampled PCM data are supplied to a multibit noise shaper (22), which frequency shape s quantization error. The oversampled, noise-shaped, PCM data is applied to an amplitude-to-time converter (24), which produces variable-width command pulses. The command pulses from converter (24) are applied to switch drive logic circuit (28) to enable switches (26) to connect a filter (30) and load (32) to power supply (34).

4. 发明公开

EP0861520A4 SMALL SIGNAL LINEARIZATION IN POWER SWITCHING AMPLIFIERS 失效
标题翻译：小信号线性化IN POWER开关放大器
公开(公告)号：EP0861520A4
公开(公告)日：2004-10-13
申请号：EP96938750
申请日：1996-10-31
申请人： APOGEE TECHNOLOGY INC
发明人： ADRIAN ANDREW ARMEN , DANIELSON MICHAEL STEPHEN , MEYERS DAVID BARRETT , SPIEGEL LEO
IPC分类号： H03F1/32 , H03F3/217 , H03F3/38
CPC分类号： H03F1/3264 , H03F3/217 , H03F2200/331
摘要： An all digital switching amplifier includes an input over-sampling filter (20) for receiving a pulse code modulated (PCM) digital input signal. Oversampled PCM data are supplied to a multibit noise shaper (22), which frequency shapes quantization error. The oversampled, noise-shaped, PCM data is applied to an amplitude-to-time converter (24), which produces variable-width command pulses. The command pulses from converter (24) are applied to switch drive logic circuit (28) to enable switches (26) to connect a filter (30) and load (32) to power supply (34).

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