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| Number | Title | Issue Date |
| 4250469 | Filter for converting pulse width modulation to amplitude modulation In a high efficiency amplitude modulation circuit. A pulse width modulation switch is arranged with a low pass filter to attentuate switching frequencies of the switch. A diode is connected in parallel with the input terminals of the low pass filter which... | 02/10/1981 |
| 4140980 | Compensation circuit for trailing edge distortion of pulse-width modulated signal When a pulse-width series modulator is connected to the cathode of an RF radio transmitter tube for the purpose of series modulation, filtration of the PWM switching signal is required to eliminate the switching signal from the output modulating signal. S... | 02/20/1979 |
