Analog continuous triangular signal generator based on built-in slice
A signal generator and triangular wave technology, applied in the direction of analog/digital conversion calibration/test, instrument, pulse generation, etc., to achieve the effect of good linearity, low hardware overhead, and flexible adjustment
Inactive Publication Date: 2008-08-06
HUNAN UNIV
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Problems solved by technology
However, as the complexity of the circuit increases, people put forward higher requirements for testing
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[0012] Referring to Fig. 1, the present invention is made up of two constant current sources I1, I2, switch M10, Schmitt trigger, capacitor C, Schmitt trigger is made up of comparator U1 and resistance R3, R4, switch M10 is p- channel transistor, the output terminal of the constant current source I1 is connected to the capacitor C, the output terminal of the constant current source I2 is connected to the capacitor C through the switch M10, the forward threshold voltage of the Schmitt trigger is connected to the positive pole of the capacitor, and the Schmitt The threshold voltage of the trigger is determined by resistors R3 and R4. The output terminal of the Schmitt trigger is connected to the control terminal of the switch M10, and the two constant current sources are automatically controlled to charge and discharge the capacitor C to generate a continuous triangular wave signal.
[0013] The constant current sources I1 and I2 are self-biased Widlar current sources, which are ...
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The invention discloses a simulated continuous triangular wave signal generator on an inner built-in plate, which consists of two constant-current sources, a switch, a Schmitt trigger and a capacitor; an output terminal of one constant-current source is directly connected with the capacitor; an output terminal of the other constant-current source is connected with the capacitor through the switch; a positive threshold value voltage terminal of the Schmitt trigger is connected with a positive electrode of the capacitor; a negative threshold value voltage terminal of the Schmitt trigger is connected with a fixed voltage; an output terminal of the Schmitt trigger is connected with a control terminal of the switch; the two constant-current sources are automatically controlled for charging or discharging the capacitor to generate continuous triangular wave signals. The triangular wave generated by the invention has good linearity and the frequency and the amplitude value of the triangular wave can be flexibly adjusted. The simulated continuous triangular wave signal generator has a simple circuit structure and small hardware expense and is easy for on-chip integration.
Description
technical field [0001] The invention relates to a triangular wave signal generator, in particular to a built-in on-chip analog continuous triangular wave signal generator. Background technique [0002] The development of integrated circuit technology makes it possible to design high-performance analog circuits and analog-digital hybrid integrated circuits. However, with the improvement of circuit complexity, people put forward higher requirements for testing. The built-in self-test structure is proposed based on the complexity of the test. It can significantly reduce test cost and reduce test time. One test structure is to use purely digital circuits to generate test vectors by using the analog results of the DAC as the input to the DAC. Obviously, to test the analog-to-digital converter under this condition, a digital-to-analog converter must be matched, and when there is no digital-to-analog converter to match, an analog test signal is required. The built-in self-test ...
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IPC IPC(8): H03K4/06H03K4/502H03M1/10G01R1/28
Inventor 何怡刚朱彦卿
Owner HUNAN UNIV