Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Generating sawtooth or triangular output
Patent
1996-06-26
1998-06-02
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Generating sawtooth or triangular output
327 95, 327 96, 327132, 327135, 327136, 327337, H03K 406
Patent
active
057606234
ABSTRACT:
A low-power differential switching amplifier (200, 210, 220, 230) is provided which utilizes a unique technique of generating interlaced ramps. The interlacing of the ramps causes the ramp discharge time to be effectively zero, which produces exceptionally accurate sawtooth waveforms with virtually no distortion. The timing of the differential switching amplifier circuitry can be synchronized with an external clock. A voltage null point is produced in the differential amplifier where zero voltage at the input of the amplifier produces essentially zero power dissipation within the load, even if the load is low-Q or substantially resistive. Also, by use of a phase balancing technique, residual errors resulting from component mismatches, which would otherwise have imposed power losses upon the load, are nulled out automatically during the operation of the amplifier. Furthermore, conventional input bias circuitry can be excluded, which reduces the size, complexity and overall power requirements of the integrated circuit.
REFERENCES:
patent: 4705961 (1987-11-01), Ainsworth et al.
patent: 4988900 (1991-01-01), Fensch
patent: 4990833 (1991-02-01), Morrish
patent: 5317199 (1994-05-01), Jordan
patent: 5391999 (1995-02-01), Early et al.
patent: 5394020 (1995-02-01), Nienaber
Brady III Wade James
Callahan Timothy P.
Donaldson Richard L.
Stewart Alan K.
Texas Instruments Incorporated
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