Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Generating sinusoidal output
Patent
1992-06-05
1996-04-02
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Generating sinusoidal output
327106, 327107, H03K 402, H03K 380
Patent
active
055044450
ABSTRACT:
There is disclosed a sine wave generating circuit including a counter (11) for counting clocks (CLK) to provide count results (B0 to B4), a control timing generating circuit (12) for converting the count results (B0 to B4) into switching control signals (D0 to D10), a synchronous circuit (13) for adjusting the timing of the switching control signals (D0 to D10) to provide switching control signals (Q0 to Q10), a weighted resistor voltage-dividing circuit (14) for voltage-dividing potentials V.sub.D2 and V.sub.S2 by means of resistors to transmit the divided potentials sequentially to a low pass filter (15) in accordance with the switching control signals (Q0 to Q10) given from the synchronous circuit (13), and the low pass filter (15) formed of a switched capacitor having a transmission zero point which is a frequency (fCLK) of the clock (CLK). Since the resistors are set such that the divided potentials are values for a sine wave, the sine wave has high accuracy and low distortion factor. Since the transmission characteristics of the low pass filter is variable depending on the clock frequency, the sine wave having a variable frequency and good effects of suppressing high-frequency components is achieved.
REFERENCES:
patent: 3484777 (1965-06-01), Delagrange
patent: 3657657 (1972-04-01), Jefferson
patent: 3838414 (1974-09-01), Wiles
patent: 3992680 (1976-11-01), Herzl
patent: 4205241 (1980-05-01), Fisher et al.
patent: 4368432 (1983-01-01), Levy
patent: 4403113 (1983-09-01), Ogita
patent: 4404430 (1983-09-01), Ogita
patent: 4446436 (1984-05-01), Ireland
patent: 4665372 (1987-05-01), Schwartz
patent: 5111072 (1992-05-01), Seidel
patent: 5121069 (1992-06-01), Burns et al.
patent: 5130571 (1992-07-01), Carroll
Simple Circuit Generates Sine Wave Digitally EDN vol. 23, No. 2 (Jan. 20, 1978).
Rom Look Up Generates Sine Wave In Frequency Synthesizer.
Callahan Timothy P.
Lam T.
Mitsubishi Denki & Kabushiki Kaisha
LandOfFree
Sine wave generating circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Sine wave generating circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Sine wave generating circuit will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2019086