Ramp wave output circuit, analog/digital conversion circuit, and camera

A technology of output circuit and output voltage, applied in the direction of delayed output pulse operation, electrical components, pulse processing, etc., can solve the problem of increasing the scale of the circuit, and achieve the effect of preventing the decline of the dynamic range

Inactive Publication Date: 2011-01-19
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since a square wave generating circuit, a waveform adder, and means for detecting the inclination of the ramp wave and controlling the amplitude of the square wave are required, the circuit scale will be greatly increased

Method used

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  • Ramp wave output circuit, analog/digital conversion circuit, and camera
  • Ramp wave output circuit, analog/digital conversion circuit, and camera
  • Ramp wave output circuit, analog/digital conversion circuit, and camera

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0054] figure 1 The circuit configuration of the ramp output circuit according to the first embodiment of the present invention is shown.

[0055] Such as figure 1 As shown, the ramp wave output circuit 7 of this embodiment includes a ramp wave generating circuit 1 and a low-pass filter 2 having a variable characteristic function.

[0056] The low-pass filter 2 of this embodiment is a low-pass filter with a variable cutoff frequency, and performs filtering processing at a first cutoff frequency during a period from when the ramp wave output by the ramp wave generating circuit 1 is received to a predetermined time T. Then, after a predetermined time T has elapsed, filtering is performed at a second cutoff frequency having a frequency higher than the first cutoff frequency. In addition, the specific circuit structure of the low-pass filter 2 is such as this figure 1 and later described Figure 3 ~ Figure 5 shown in .

[0057] figure 1 The shown low-pass filter 2 is a prima...

Deformed example 1

[0062] image 3 A circuit configuration including the low-pass filter 2 a of Modification 1 and the ramp output circuit 7 a of the aforementioned ramp generating circuit 1 is shown.

[0063] Such as image 3 As shown, the low-pass filter 2a of Modification 1 is a primary low-pass filter with a switchable resistance value structure, including: a resistor 3, a resistor 4, a switch 5, and a capacitor 6, for example, a resistor 3 with a resistance value R1 It is connected in series with a resistor 4 having a resistance value R2 sufficiently larger than the resistance value R1, the resistor 4 is connected in parallel with a switch 5, and one end of a capacitor 6 having a capacitance value C1 is connected to the resistor 4 and the switch 5.

[0064] The ramp wave output circuit 7a having the above structure is the same as when having the structure of the above-mentioned low-pass filter 2, and the switch 5 is turned off before the ramp wave from the ramp wave generating circuit 1 st...

Deformed example 2

[0066] Figure 4 A circuit configuration including the low-pass filter 2b according to Modification 2 and the ramp output circuit 7b of the aforementioned ramp generating circuit 1 is shown.

[0067] Such as Figure 4 As shown, the low-pass filter 2b of this modification 2 is a primary low-pass filter with a structure of switching capacitance, and has: a resistor 3, a switch 5, a capacitor 6, and a capacitor 13, for example, a capacitor 6 with a capacitance value C1 It is connected in series with a capacitor 13 having a capacitance value C2 that is sufficiently larger than the capacitance value C1, and the capacitor 6 is connected in parallel with the switch 5. One end of the resistor 3 having a resistance value R1 is connected to the ramp wave generating circuit 1, and the other end is connected to the capacitor 13. .

[0068] In the ramp wave output circuit 7b having the above configuration, the switch 5 is turned on from before the ramp wave generation from the ramp wave ...

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PUM

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Abstract

A ramp wave output circuit includes a ramp wave generation circuit (1) which generates a ramp wave and a low-pass filter (2) having a variable cut-off frequency for receiving the ramp wave. The low-pass filter (2) operates with a first cut-off frequency for a predetermined time from the reception of the ramp wave and operates with a second cut-off frequency greater than the first cut-off frequency after a predetermined time has elapsed.

Description

technical field [0001] The present invention relates to a ramp wave (ramp wave) output circuit with a low-pass filter for removing noise, and an analog-to-digital conversion circuit with the ramp wave output circuit, particularly to a ramp wave that can expand the linear region of the ramp wave. wave output circuit. Background technique [0002] The analog-to-digital conversion technology using ramp waves can convert multiple analog signals into digital signals in parallel, so in systems that need to convert multiple pixel signals into digital signals, such as image sensors, it is used to achieve high-speed systems. method has received more attention. [0003] In this technology, since analog-to-digital conversion is performed by comparing individual analog signals supplied to a plurality of comparators with ramp waves supplied to each comparator in common, the characteristics of the ramp wave have a greater impact on the characteristics of the analog-to-digital conversion....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K5/1252H03K4/02H03K4/08
CPCH03K5/082H03K4/08H03K2005/00293H04N25/78
Inventor 山冈优介木村博樋口真浩
Owner PANASONIC CORP
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