Modulators – Pulse or interrupted continuous wave modulator – Pulse width modulator
Patent
1996-11-27
1998-08-04
Grimm, Siegfried H.
Modulators
Pulse or interrupted continuous wave modulator
Pulse width modulator
375238, H03K 708
Patent
active
057899924
ABSTRACT:
A method for generating a pulse width modulated signal having a linear relationship to a digital input data signal includes generating a series of PWM component signals, multiplying (ANDing) each of the component signals with one bit of the digital input data, and then summing (ORing) the resulting signals to generate the PWM signal. Each of the component signals corresponds to a single bit of a multi-bit, monotonically increasing counter signal. Each component signal is generated by asserting the component signal only when the corresponding counter bit is asserted and the lower ranking counter bits are not asserted. Two's complement input data can be accommodated by selectively inverting the lower ranking digital input data bits in response to the logic state of the highest ranking input data bit which acts as a sign bit. The multi-bit counter signal is generated by a counter which increments the counter signal by one for each cycle of a clock signal. A component signal generator generates the component signals in response to the counter signal. A selection logic circuit combines the component signals and the digital input data to generate the PWM signal. The selection logic circuit includes a series of multiplexers for selectively inverting the input data in response to one of the input data bits, a multiplier circuit for multiplying each of the component signals with one bit of the digital input data, and a summing circuit for summing the resulting signals to generate the PWM signal.
REFERENCES:
patent: 4164714 (1979-08-01), Swanson
patent: 5363406 (1994-11-01), Han
Grimm Siegfried H.
Samsung Electronics Co,. Ltd.
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