Bipolar voltage-controlled oscillator used in r/d converter and its control method
A voltage-controlled oscillator, bipolar technology, used in analog-to-digital converters, etc.
Active Publication Date: 2018-10-23
NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC
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Problems solved by technology
[0004] At present, the conventional voltage-controlled oscillator design cannot meet the above-mentioned special requirements of the R / D converter. For example, the voltage-controlled oscillator AD560 of the American AD company has a unipolar voltage input and has no counting pulse BUSY and latching pulse LATCH. , the logic level DIR signal in the counting direction, etc., so it is necessary to design a bipolar voltage-controlled oscillator that meets the tracking requirements of the R / D converter
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[0027] The present invention will be further described below in conjunction with accompanying drawing:
[0028] like figure 1 As shown, the bipolar voltage-controlled oscillator used in the R / D converter of this embodiment includes an integrator circuit 1, a dual-threshold comparison circuit 2, a first monostable pulse shaping circuit 3, and a discharge loop control circuit 4. The second monostable pulse shaping circuit 5, polarity detection circuit 6, bidirectional constant current source circuit 7 and anti-vibration protection circuit 8; the input terminal of the integrator circuit 1 is connected with the voltage source, and its output terminal is respectively connected with the Vibration stop protection circuit 8, double-threshold comparison circuit 2 are connected to polarity detection circuit 6, the output end of anti-vibration stop protection circuit 8 is connected to the discharge switch control end of integrator circuit 1, and the output end of double-threshold compari...
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The invention relates to a bipolar voltage-controlled oscillator and a control method thereof for an R / D converter. The bipolar voltage-controlled oscillator comprises an integrator circuit. An input terminal of the integrator circuit is connected with an external voltage source, and an output terminal is connected with an anti-oscillation-stop protection circuit, a dual-threshold comparison circuit and a polarity detection circuit. An output terminal of the anti-oscillation-stop protection circuit is connected with a control terminal of the integrator circuit. An output terminal of the dual-threshold comparison circuit is connected with an input terminal of a second monostabtle pulse shaping circuit via a first monostabtle pulse shaping circuit. An output terminal of the polarity detection circuit is connected with a discharge selection control terminal of a two-way constant current source circuit. An output terminal of the two-way constant current source circuit is connected with the input terminal of the integrator circuit via a discharge loop control circuit. An output terminal of the first monostabtle pulse shaping circuit is connected with a control terminal of the discharge loop control circuit. The invention makes it possible to receive bipolar direct-current voltage input, and satisfies the technical requirements on bipolar voltage-controlled oscillators needed by continuous tracking-type R / D converters.
Description
technical field [0001] The invention relates to the field of R / D converter analog-digital tracking loop circuit design, in particular to a bipolar voltage-controlled oscillator used in the R / D converter and a control method thereof. Background technique [0002] The R / D converter is one of the key devices in the shaft angle servo control system. It is used in the system to digitize the position / angle analog quantity, and is connected to the host computer through a standard interface circuit to realize real-time reading of data information. . R / D converters are used in important weapon systems such as aerospace, aviation, weapons, and ships, and are also widely used in CNC machine tool servo mechanisms, automotive electric power steering measurement, engine motion detection and control, and scanning, searching, positioning, and navigation , measurement and many other civilian servo control fields. [0003] The R / D converter is an analog / digital continuous tracking conversio...
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IPC IPC(8): H03M1/12
Inventor 高群周晶潘美珍邹祥
Owner NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC