Apparatus for amplifying a signal using digital pulse width modulators
First Claim
Patent Images
1. An electronic apparatus comprising:
- a digital processor producing a first digital signal and a second digital signal;
a first digital pulse width modulator responsive to the first digital signal;
a second digital pulse width modulator responsive to the second digital signal;
a first driver responsive to the first digital pulse width modulator;
a second driver responsive to the second digital pulse width modulator;
a first analog pulse width modulator responsive to the first driver;
a second analog pulse width modulator responsive to the first analog pulse width modulator and the second driver;
a switch capacitance responsive to the first analog pulse width modulator;
a first band pass filter responsive to the first analog pulse width modulator; and
a second band pass filter responsive to the switch capacitance.
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Abstract
An electronic apparatus that includes a digital processor (12), a first digital pulse width modulator (304), a second digital pulse width modulator (306), a combining circuit (308), and a load (310). The digital processor (12) produces a first digital signal (314) and a second digital signal (316). The first digital pulse width modulator (304) is responsive to the first digital signal (314), and the second digital pulse width modulator (306) is responsive to the second digital signal (316). The combining circuit (308) is responsive to the first digital pulse width modulator (304) and the second digital pulse width modulator (306). The load (310) is responsive to the combining circuit (308).
105 Citations
19 Claims
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1. An electronic apparatus comprising:
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a digital processor producing a first digital signal and a second digital signal; a first digital pulse width modulator responsive to the first digital signal; a second digital pulse width modulator responsive to the second digital signal; a first driver responsive to the first digital pulse width modulator; a second driver responsive to the second digital pulse width modulator; a first analog pulse width modulator responsive to the first driver; a second analog pulse width modulator responsive to the first analog pulse width modulator and the second driver; a switch capacitance responsive to the first analog pulse width modulator; a first band pass filter responsive to the first analog pulse width modulator; and a second band pass filter responsive to the switch capacitance. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electronic apparatus comprising:
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a digital logarithm based processor including a logarithm converter, a digital logic circuit, and an inverse logarithm converter; a first digital pulse width modulator responsive to the digital logarithm based processor; a second digital pulse width modulator responsive to the digital logarithm based processor; a first driver responsive to the first digital pulse width modulator; a second driver responsive to the second digital pulse width modulator; a first analog pulse width modulator responsive to the first driver; a second analog pulse width modulator responsive to the first driver; a first switching element responsive to the first analog pulse width modulator and to the second driver; a second switching element responsive to the first switching element and the second driver; a third switching element responsive to the second analog pulse width modulator and to the second driver; a fourth switching element responsive to the third switching element and the second driver; a first band pass filter responsive to the first and second switching elements; and a second band pass filter responsive to the third and fourth switching elements. - View Dependent Claims (15, 16)
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17. An electronic apparatus comprising:
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a first digital pulse width modulator receiving an amplitude modulated digital signal; a second digital pulse width modulator receiving a frequency modulated digital signal; a first driver responsive to the first digital pulse width modulator; a second driver responsive to the second digital pulse width modulator; a first analog pulse width modulator responsive to the first driver; a second analog pulse width modulator responsive to the first analog pulse width modulator and the second driver; a switch capacitance responsive to the first analog pulse width modulator; a first band pass filter responsive to the first analog pulse width modulator; and a second band pass filter responsive to the switch capacitance. - View Dependent Claims (18, 19)
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Specification