US3737639A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Derivation of a tangent function using an integrated circuit four-quadrant multiplier
Assignee: Individual
•
Filing: 1972-05-17
•
Granted: 1973-06-05
•
Expires: 1992-05-17
Abstract
Abstract A tangent function generator is provided which utilizes input signals proportionate to the sine and cosine of a given angle. The equipment accomplishes a trigonometric manipulation which forms an output signal substantially independent of the input reference voltage but proportional to the tangent of the angle. The device uses a multiplier and operational amplifier.
Inventors
- 👤 J Fletcher
- 👤 B Bregman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:12
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
160 words
A tangent function generator for generating a signal proportionate to the tangent of a given angle derived from inputs of the sine and cosine of the given angle wherein the sine and cosine functions are referenced to a given reference voltage and comprising a circuit means for forming an output signal proportional to the function Sin theta /Cos theta where the trigonometric functions of theta are represented by the input signals to the generator and said output signal is substantially independent of the given reference voltage and is proportional to the ratio of the value of at least two fixed circuit components, said circuit means including operational amplifier means coupled to receive said sine function signal as an input and multiplier circuit means having two inputs and forming an output corresponding to the multiplication of the inputs, one of said two inputs being the cosine function signal and the other input being provided from the output of the operational amplifier.
Claim 2
Dependent Claim
160 words
A tangent function generator for generating a signal proportionate to the tangent of a given angle derived from inputs of the sine and cosine of the given angle wherein the sine and cosine functions are referenced to a given reference voltage and comprising a circuit means for forming an output signal proportional to the function Sin theta /Cos theta where the trigonometric functions of theta are represented by the input signals to the generator and said output signal is substantially independent of the given reference voltage and is proportional to the ratio of the value of at least two fixed circuit components, said circuit means including operational amplifier means coupled to receive said sine function signal as an input and multiplier circuit means having two inputs and forming an output corresponding to the multiplication of the inputs, one of said two inputs being the cosine function signal and the other input being provided from the output of the operational amplifier.
Claim 3
Dependent Claim
37 words
The function generator of claim 1 wherein said amplifier receives a second signal as a feed back signal applied to the input of said amplifier which signal is derived from the output of said multiplier circuit means.
Claim 4
Dependent Claim
49 words
A function generator as described in claim 2 wherein said multiplier means is connected at its output through a first fixed resistor and the sine function is input through a second fixed resistor and the tangent output signal is proportional to the ratio of the former to the latter.
Claim 5
Dependent Claim
28 words
A function generator of the character described in claim 2 wherein said multiplier circuit means is a four-quadrant multiplier for multiplying input signals of like or dissimilar polarities.
References Cited (Backward Citations)
US2953303A
Cited
US2948474A
Cited
US3250904A
Cited
US3496565A
Cited
US3601593A
Cited
US3646337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |