SU1598107A1 - Amplitude detector - Google Patents

Abstract

The invention relates to radio engineering. The purpose of the invention is to increase the resolution when detecting unipolar signals. The amplitude detector (AM) contains peak detectors 1 and 2, unit 6 for selecting the highest voltage value, generator 11 of two sequences that are shifted relative to each other by half the period of the pulses of the normalized current. Peak detectors 1 and 2 consist of an operational amplifier 3, a diode 4 and a capacitor 5. When a voltage pulse occurs at the AM input, the capacitors 5 of the peak detectors 1 and 2 are charged simultaneously to the amplitude value of the input voltage. At the time of arrival of the normalized current pulse, the capacitor 5 of the corresponding peak detector 1 and 2 is discharged to the level of the instantaneous value of the input voltage. Since the normalized current pulses are alternately generated in time, the voltage on one of the capacitors 5 remains constant for the duration of the pulse on the other capacitor 5. This voltage is transmitted to the AM output through block 6. To reduce the distortion of the detected signal of the input signal frequency from generator 11 should be close to each other. 2 Il.

Description

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The invention relates to radio engineering and can be used to detect AM signals.

The purpose of the invention is to increase the resolution when detecting unipolar signals.

.In FIG. Figure 1 shows a structural electrical circuit of an amplitude detector; figure 2 - diagram of his work. Q

The amplitude detector contains first and second peak detectors 1 and., Each consisting of an operational amplifier (OU) 3, diode 4 and a storage capacitor 5, block 6 for selecting the most J5 higher voltage value, consisting of the first and second OU 7 and 8, the first and second diodes 9 and 10, and the generator 11 of two sequences shifted one relative to the other 20 I I, half the period of the pulses of the normalized current.

The amplitude detector works as follows. 25

In the absence of an input signal (Hfjc 0), the voltage at the output of the amplitude detector is zero, and the current pulses with generator 11 do not affect the output voltage, as they have a negative polarity and serve to discharge the capacitors 5 of the first and second peak detectors 1 and 2.

I

When an amplitude voltage pulse detector (Fig. 2a) appears at the input, the capacitors 5 of the first and second peak detectors 1 and 2 are charged simultaneously to the amplitude value of the input voltage.

At the time of arrival of a pulse of normalized current from the corresponding generator output 11 (fng.2b, c), the capacitor 5 of the corresponding peak detector 1 or 2 is discharged to the level of the instantaneous value of the voltage Ug (t). Since the normalized current pulses are generated at the outputs of the generator 11 alternately in time (Fig. 2d, d), the TO on one of the capacitors 5, the voltage remains unchanged for the duration of the pulse on the other capacitor 5 of the other peak detector 1 or 2. This voltage A hypo output of the amplitude detector is transmitted through the block of the selection of the highest voltage (Fig. 2e).

To reduce the envelope distortion of the detected signal, the frequencies of the input signal and the signal from generator 11 should be close to each other.

Claims (1)

Invention Formula Amplitude detector containing. The first and second peak detectors, the inputs of which are the input of the amplitude detector, and the outputs are connected to the inputs of the unit for selecting the highest voltage value, the output of which is the output of the amplitude detector, characterized in that, in order to increase the resolution when detecting monopolar signals , a generator of two sequences is introduced, shifted one relative to the other by half the period of the pulses of the normalized current, the outputs of which are connected respectively to storage capacitors rvogo and second peak detectors.