SU572896A1 - Device for shaping quadrature signals - Google Patents

Description

one

- The invention relates to radio engineering and can be used in radio navigation and radar installations, in phase metering technology, as well as for performing single sideband modulation by converting the input voltage into quadrature signals.

A device for generating quadrature signals, containing an input unit for phase-splitting the input signal, a pulse generator connected to the start input of the comparison unit, its outputs are connected to the inputs of the reversing-counting unit, and two groups of n switches, the control inputs of which are connected to the corresponding outputs reversely The counting unit, and the outputs of the keys of each soil are connected respectively to the first and second inputs of the comparison unit and are outputs of the device 1.

However, the known device does not allow to obtain quadrature signals in a wide frequency range.

In order to expand the frequency range of the generated quadrature signals, a total difference transformer with adjustable transformation ratios is introduced into the proposed device for generating quadrature signals. The inputs of the input unit for splitting the input signal are connected to the inputs of each sum total transformer with adjustable conversion factors. with the input of the corresponding key of the first group, and each of the n differential outputs is totalized stnogo transformer reg) liruemymi transformation coefficients input connected to a corresponding key of the second group.

The drawing shows a structural electrical circuit of the proposed device.

A device for generating quadrature signals contains a unit 1 for pre-phase-splitting the input signal, a generator of 2 pulses connected to the start input of the comparison unit 3, its outputs are connected to the inputs of the reverse-counting block 4, and two groups of n keys 5 whose control inputs are connected with the corresponding outputs of the reversing and counting unit 4, and the outputs, respectively, with the first and second inputs of the comparison unit 3, are the outputs of the device, the total difference

a transformer 6 with adjustable transformation ratios, to the inputs of which are connected the outputs of the unit 1 of the pre-phase separation of the input signal, the number of n total outputs of the sum-difference transformer 6 with adjustable

transformation ratios are connected to the input of the corresponding key 5 of the first grunts, and each of the n difference outputs of the sum-difference transformer 6 with adjustable transformation ratios is connected to the input of the corresponding key 5 of the second group.

The device works as follows.

Signals with a relative phase shift lying within, from the pre-phase-expansion unit of the input signal are fed to the input of the total difference transformer 6, which has unbalanced or symmetrical inputs relative to the housing. Bridging a phase synapse requires the presence of symmetrical input circuits.

The secondary windings of the total difference transformer have a sufficiently large number of leads for changing the transformation coefficient using one winding according to the sec f / 2 law, and another using cosec f / 2, and a discretely uniform course of the argument or the functions themselves can be specified. The outputs from the secondary windings of the total differential transformer 6 are connected to the electronic switches 5, the outputs of the latter, in turn, form the asymmetrical outputs of the device as a whole (Out of Output 2).

In each group of 5 keys, only one of them is in the open state.

The unit 3 is connected to the unbalanced outputs of the device (null-organ), which is connected to the circuit: pulse generator 2 — reversible-counting unit 4. Reverse-counting unit 4 has two inputs, and the direction of operation of its cells is determined by comparison unit 3. The outputs of the reversing-counting unit 4 are connected to the corresponding control inputs of the electronic switches 5.

The signal arriving at the input of the device is converted by means of block 1 of the pre-phase extension into two phase-shifted signals. The angle -f of the phase shift between these signals depends on the frequency of the input signal and may be in the range of 0-.

As a result of vector addition and subtraction, which occurs in the total difference transformer 6, two signals shifted by an angle φ, quadrature signals having a phase shift equal to 90 ° and different amplitudes appear on its secondary windings. Due to the fact that in each of the n groups of electronic keys 5 only one key 5 is in the open state, the outputs of the device as a whole and at the inputs of the comparison unit 3 are quadrature signals of different amplitudes. In this case, the comparison unit 3 closes the circuit between the pulse generator 2 and the reversing-counting unit 4. The voltages taken from the cells of the reversible counting unit 4 ensure the sequential operation of the electronic keys 5 in groups.

The sequential operation of these keys 5 under the influence of signals from the reversing-counting unit 4 occurs until the amplitudes of the output signals at the outputs of the device equalize. When the amplitudes are equal, the control element of the comparison unit 3 (relay to three positions) turns off the generator of 2 pulses from the reversing-counting unit 4, the propagation of pulses within which stops, the control voltage is removed from only one of the cells (triggers) of this block, as a result Two quadrature and equal in amplitude sigal are supplied to the outputs of the device.

The proposed device, in comparison with the known, allows to obtain two voltages of the same amplitude with a constant phase difference of 90 °, and to expand the regions of operating frequencies.

Claims (1)

1. USSR author's certificate №365800, cl. N OZN 7/22 1971. 1 G R |