Pulse-width-modulated digital-to-analog converter with high gain

Details Pulse-width-modulated digital-to-analog converter with high gain Pulse-width-modulated digital-to-analog converter with high gain

1996-07-09

1998-01-27

Fleming, Fritz

Coded data generation or conversion

Analog to or from digital conversion

Digital to analog conversion

341145, 375238, H03M 182

Patent

active

057126364

ABSTRACT:
A pulse-width-modulated digital-to-analog converter is responsive to a digital control value for switching between a high gain mode and a low gain mode. The converter includes a free-running rollover counter, a reference register and a comparator. Pulses from a comparator are split into two paths, one path including a switch, and fed into a plurality of resistive elements connected connected to a common output node. Depending on the state of the switch, the network's output value will either follow its input or be a fraction thereof, without change of duty cycle or output impedance. The output node may be connected to a capacitive element to form a low pass filter for generating an analog waveform.

REFERENCES:
patent: 4595910 (1986-06-01), Wine
patent: 4742329 (1988-05-01), Yamada et al.
patent: 4931751 (1990-06-01), Keller et al.
patent: 5021788 (1991-06-01), Ueki et al.
patent: 5148168 (1992-09-01), Masuda et al.
patent: 5255136 (1993-10-01), Machado et al.
AN538, "Using PWM to Generate Analog Output in PIC17C42", Embedded Control Handbook, .COPYRGT.1992, Microchip Technology, Inc., pp. 3-13 to 3-14.
AN539, "Frequency and Resolution Options for PWM Outputs in the PIC17C42", Embedded Control Handbook, .COPYRGT.1992, Microchip Technology, Inc., pp. 3-3 to 3-12.

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