Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1981-08-04
1983-10-11
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307262, 307529, 340347DA, H03B 1900, H03K 500
Patent
active
044095554
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to devices for converting electrical signals of one frequency to electrical signals of another frequency, and more particularly to quadrature stepwave frequency converters.
BACKGROUND OF THE INVENTION
The present invention can most advantageously be used in quadrature harmonic oscillators, synchronous detectors and devices for measuring the phase of an electrical signal against the background of noise.
A quadrature stepwave frequency converter is a device having two outputs and provided with one or two inputs for receiving the signals to be converted and with control inputs supplied with binary control signals so that the gain for the signal transmitted from the input of the device to its one output varies according to a predetermined periodic step function and the gain for the signal transmitted from the input of the device to its other output varies according to a periodic step function shifted in phase by 90.degree. in relation to the function characterizing variation of the gain for the signal transmitted from the input of the device to its first output.
Quadrature stepwave frequency converters must provide, on the one hand, a precise agreement between the law of variation of each of the gains and the corresponding step function waveform, and, on the other hand, a precise phase shift of 90.degree. between the curves characterizing variations of the gain.
DESCRIPTION OF THE PRIOR ART
Known in the art is a stepwave frequency converter (cf. U.S. Pat. No. 3,517,298) comprising a sequencer and two circuits having variable gains and connected in parallel, each of said variable-gains circuits having a plurality of control inputs for changing the absolute value of the gain provided by the circuit upon a change in the binary signals applied to its control inputs so that a change in the value of the binary signal applied to a control input of a circuit causes it to change its gain by a predetermined value corresponding to this control input and in a direction determined by the direction of the change in the binary signal and so that the same changes in the binary signals at the mutually corresponding control inputs of different circuits cause the circuits to change their gains by the same values and in the same direction. Some outputs of the sequencer are respectively connected to the control inputs of one variable gain circuits for supplying said control inputs with binary signals periodically changing their values so that the binary signal applied to a first control input changes its value at regular time intervals and the binary signal applied to each next-in-order control input changes in a direction providing an increase in the circuit gain after a change in a similar direction in the binary signal at the preceding-in-order control input and changes in a direction providing a decrease in the circuit gain before a change in a similar direction in the binary signal at the preceding-in-order control input. The other outputs of the sequencer are respectively connected to the control inputs of the other variable gain circuit for supplying said control inputs with binary signals shifted in phase by 180.degree. with respect to the binary signals applied to the corresponding control inputs of the first circuit. The input signals are applied to the input of one of the variable gain circuits directly and to the input of the other circuit via an inverting amplifier, the output signals of both the circuits being summed.
A change in the value of the binary signal at the first control input of one of the circuits in the direction providing an increase in gain causes the absolute value of the total gain to increase. The subsequent changes in the binary signals at the other control inputs of this circuit produce a stepped increase in the absolute value of the gain for the input signal up to a maximum value. Then the values of the binary signals at the control inputs of this circuit change in the opposite direction, the changes in the binary signals occurring in th
REFERENCES:
patent: 3728719 (1973-04-01), Fish
patent: 3747088 (1973-07-01), Pastoriza
patent: 4336526 (1982-06-01), Weir
patent: 4336528 (1982-06-01), Kane
V. S. Gutnikov Article (Integrated Electronics in Measuring Techniques) Publ. in 1974 by "Energiya" and Translation.
Article A Sine Wave Digital Generator by Karl Heinz Muller, Elektronik 1975 Heft 12, p. 414 and Translation.
Khyarm Khyarmo E.
Min Mart V.
Parve Toomas E.
Pungas Toom A.
Callahan Timothy P.
Heyman John S.
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