SU387517A1 - LOGARIFM TRANSFER RELATING AMNLITUDE PAIR PULSED DURING A TIME INTERVAL - Google Patents

Description

one

The invention relates to automation and can be used in various measuring apparatus.

The known logarithm of the ratio of the amplitudes of paired pulses to the time interval, contains a DC amplifier whose input is connected to the input pulse source, and the output is connected to the input of the pulse selector, the outputs of which are connected to the inputs of two pulse amplitude memory, one input which is associated with the output of the first pulse amplitude memory circuit, and the second input is connected with the output of the second pulse amplitude memory circuit through the key, with a storage capacitor and one output bit go resistor, has low accuracy.

The purpose of the invention is to improve the accuracy of the converter.

For this, the second output of the discharge resistor is connected to the connection point of the output of the DC amplifier and the input of the pulse selector.

The drawing shows the block diagram of the proposed Converter.

The converter contains a DC amplifier 1, a selector 2, circuits and 4 pulse amplitude memorization, a switch 5, a bit-high 6 and a zero element 7, a capacitor 8. The amplifier output / is connected to the selector input 2 pulses, the outputs of which are connected to the circuit inputs 5 and 4, the pulse amplitude memorization. Zero Organ Entry 7

connected to the output of the amplitude memory circuit 4, and the second input to the output of the amplitude memory circuit 3 via the switch 5, with the storage capacitor 8 and one | M output of the discharge resistor 6. The second output

of the discharge resistor 6 is connected to the connection point of the amplifier 1 and the selector 2. The converter input is terminal 9.

The Converter operates as follows.

The pair of pulses entering the input 9 with amplitudes f / i and U are amplified by the reinforcement gel. The selector 2 directs one of the paired pulses to the input of the amplitude memorizing circuit 3, and the other to the input of the amplitude memorizing circuit 4. The capacitor 8 through the key 5 is charged to the voltage of the input signal. The measurement cycle starts after the end of pulses and transients. At the beginning of the measurement, key 5 opens

and the capacitor 8 is discharged through the resistor 6 and the output impedance of the amplifier. At the time of the equality of the voltages on the capacitor 8 and the output of the circuit 4 for storing the amplitude of the pulse of the zero-organ 7 produces

pulse. The time interval / from the moment of appearance of the pulse, at the output of the null organ 7, is proportional to the natural logarithm of the ratio of the amplitudes of the pulses Ui and U and is determined by the following relation:

f /.

f - -An and.

where (R + ri) .C;

C is the value of the capacitor capacitance 8; R is the resistance value of the resistor 5; R | - output impedance amplifier.

Usually the condition is met. Mathematically, it can be shown that in the proposed converter, a zero-level offset does not create an additional error, and the conversion is without an error caused by the zero offset of the amplifier.

Subject invention

A logarithm of the ratio of the amplitudes of paired pulses to the time interval, containing a DC amplifier whose input is connected to the input pulse source, and the output to the input of the pulse selector, whose outputs are connected to the inputs of two pulse amplitude memory circuits, zero-body, one input of which associated with the output of the first memory circuit of the amplitudes of the pulses, and the second input - with the output of the second memory circuit of the amplitudes of the pulses through the key, with a storage capacitor and one output of the discharge resistor Pa, characterized in that, in order to improve the accuracy of the converter, the second output of the discharge resistor is connected to the connection point of the output of the DC amplifier and the input of the pulse selector.