Electronic circuit device

Abstract

Circuit (1a) including an analog circuit processes an analog input signal (Vin). Moreover, the circuit (1a) including the analog circuit outputs a coefficient s1 indicating predetermined characteristic of the analog circuit of the circuit (1a) including the analog circuit and inputs it to a coefficient detection / control circuit (1b). The coefficient detection / control circuit (1b) processes and detects the coefficient s1 as a signal value, thereby detecting the characteristic of the analog circuit. The coefficient detection / control circuit (1b) outputs a control signal s2 in accordance with the detection result of the obtained coefficient s1 and inputs it into the circuit (1a) including the analog circuit. Thus, the coefficient detection / control circuit (1b) adjusts the operation state of the analog circuit and controls the operation of the circuit (1a) including the analog circuit. Thus, it is possible to use the manufactured analog circuit with a high accuracy and realize an electronic circuit device capable of reducing the power consumption and the circuit size of the analog circuit.

Description

technical field [0001] The present invention relates to the adjustment of power consumption in circuits including analog circuits, in particular to A / D conversion circuits for converting analog input values ​​into digital value outputs. Background technique [0002] As a circuit including an analog circuit, there is an A / D conversion circuit that converts an analog input value into a digital value output. Non-Patent Document 1 ("A 10b, 20Msample / s, 35mW Pipeline A / D Converter (20M samples / s, 35mW Pipeline A / D Converter)", IEEEJOURNAL OF SOLID-STATE CIRCUITS, VOL.30, NO.3 , MARCH 1995) describes in detail a pipeline A / D conversion circuit that performs high-speed A / D conversion in multiple stages in the A / D conversion circuit. FIG. 11 shows the configuration of the pipeline A / D conversion circuit 100 . The pipeline A / D conversion circuit 100 is provided with a plurality of stages (1st stage to Nth stage) 106-109, and its kth (k=1-N) stage (STAGEk) is provided with an input ...

AI Technical Summary

Problems solved by technology

In this way, the larger the margin is, the shorter the stabilization time will be, but the power consumption will also increase accordingly.

Also, time constants due to on-resistance of switches and parasitic components of wiring are not considered in this discussion

[0020] In addition, in applications where the sampling speed varies, when an analog circuit with the same stability characteristics is used, the stabilization time of the output voltage Vout is the same regardless of the sampling speed. , as much as the sampling time increases, it will be extended as much as possible. In the case of a long sampling time, an unnecessary large margin will be left

For example, as shown in FIG. 13 , when the sampling speed is sufficient for the output voltage Vout to reach V1 within a predetermined time t2 that is greater than t1 , a stable characteristic like the curve c5 may be used, but the sampling speed is adopted within the predetermined time t1. The current of the MOS transistor that reaches the output voltage V1 is in a stable state like the curves c1 to c4, and the time is extended by t2-t1 compared with the above case

Therefore, there is such a problem that when the sampling speed is changed and used, the current consumption of the analog circuit is constant, so when the operation is slowed down, the current consumption will exceed the required amount and become excessive.

[0021] In order to solve this problem, it is conceivable to prepare a plurality of bias voltage generating circuits for inputting the bias voltage to the amplifier, and adopt a structure that can change the output voltage of the bias voltage generating circuit, etc., but in general, an analog circuit whose characteristics vary every time it is manufactured It is impossible to predict the characteristics at the time of completion, and even if there is a bias voltage generation circuit that can change the output value, it is difficult to set the set value itself

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