A device for collecting pulse signals
A technology of pulse signal and preamplifier circuit, applied in the direction of automatic power control, electrical components, etc., which can solve the problems of difficulty in extracting effective signals, excessive amplification factor, low amplitude of pulse signal, etc.
Inactive Publication Date: 2018-03-13
JILIN ANYIJIA THERMAL ENERGY MEASUREMENT
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Problems solved by technology
[0003] However, due to the low amplitude of the pulse signal, if the amplification factor of the signal amplification circuit is too small, it is difficult for the subsequent circuit to extract effective signals; if the amplification factor of the signal amplification circuit is too large, it may cause useful signals to be submerged in the in the noise
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[0030] figure 2 A circuit diagram of a preamplifier circuit provided by the present invention. As a preferred embodiment, the preamplifier circuit adopts AD8604 amplifier;
[0031] Wherein, the AD8604 amplifier includes a first-stage non-inverting amplifying circuit 100 , a second-stage non-inverting amplifying circuit 101 , a second-order infinite gain multi-channel feedback bandpass filter 102 and a third-stage non-inverting amplifying circuit 103 .
[0032] In specific implementation, considering that the output impedance of the transducer is relatively large, the preamplifier circuit must have a sufficiently large input impedance, so the present invention adopts the AD8604 amplifier, which is a four-channel, rail-to-rail input and output, Single-supply amplifier with very low offset voltage and wide signal bandwidth. Excellent performance is achieved without laser adjustment. And the gain-bandwidth product of AD8604 is 8MHz, and the slew rate is 5V / μs. After fully mee...
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The invention discloses a device for acquiring pulse signals, which is applied to an energy transducer of an ultrasonic heat meter. The device comprises a preamplifier circuit for acquiring the pulse signals of the energy transducer and amplifying the pulse signals, a phase locked loop circuit for filtering the signals amplified by the preamplifier circuit, and a timing chip for timing the signals filtered by the phase locked loop circuit, wherein the input end of the preamplifier circuit is connected with a pair of reverse diodes in order to ensure clamping. Compared with the prior art in which only a signal amplification circuit is adopted, the device with the phase locked loop circuit has the advantage that the amplification factor of the preamplifier circuit does not need to be too large, so that the pulse signals are effectively prevented from being submerged in noise.
Description
technical field [0001] The invention relates to the field of signal collection, in particular to a device for collecting pulse signals. Background technique [0002] Ultrasonic heat meter measures the flow rate and displays the heat energy released or absorbed by the water flowing through the heat exchange system by means of ultrasonic waves. In the specific implementation, the amplitude of the pulse signal sent by the transducer of the ultrasonic heat meter is low, and it is easy to be overwhelmed by the noise. Therefore, at present, the extraction of the pulse signal is mainly realized by the signal amplification circuit. [0003] However, due to the low amplitude of the pulse signal, if the amplification factor of the signal amplification circuit is too small, it is difficult for the subsequent circuit to extract effective signals; if the amplification factor of the signal amplification circuit is too large, it may cause useful signals to be submerged in the in the noise...
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IPC IPC(8): H03L7/08H03L7/099
Inventor 刘革张岩赵禺
Owner JILIN ANYIJIA THERMAL ENERGY MEASUREMENT