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Reference voltage generating circuit and voltage amplifier adopting same

A technology of voltage amplifiers and reference voltages, applied to amplifiers with semiconductor devices/discharge tubes, DC-coupled DC amplifiers, amplifiers, etc., can solve problems such as large time delays, and achieve low power consumption and simple configuration.

Inactive Publication Date: 2003-10-08
SOCIONEXT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Also, since the time until the intermediate voltage of the peak value and the valley value is stabilized is the sum of the time for each output of the peak detection and holding circuit and the valley detection and holding circuit to be stable, and the time for the output of the voltage divider circuit to be stable, There is a problem with large time delays

Method used

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  • Reference voltage generating circuit and voltage amplifier adopting same
  • Reference voltage generating circuit and voltage amplifier adopting same
  • Reference voltage generating circuit and voltage amplifier adopting same

Examples

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no. 1 Embodiment approach

[0065] figure 1 The reference voltage generating circuit according to the inventions 1, 2, 3, 4, and 5 of the first embodiment is shown.

[0066] In this figure, one end of the first capacitor 1 is grounded (here, a predetermined voltage VDD, which functions as a minimum value holding circuit). The other end is connected in series with a capacitor row 4 formed by connecting the second and third capacitors 2 and 3 in series. The switches SW1 to SW3 are connected in parallel with the two ends of the capacitors 1 to 3 respectively, and play the role of removing the electric charge. In addition, VIC is a voltage-to-current conversion circuit, which inputs an input voltage signal Vin on its input side, and is connected to a circuit in which the first capacitor 1 and the capacitor row 4 are connected in series on its output side, and functions until the input voltage Vin is connected to the output The capacitors 1 to 3 are charged (or discharged) until the voltages are equal.

[...

no. 2 Embodiment approach

[0089] figure 2 A reference voltage generating circuit according to the invention described in the sixth embodiment of the present invention is shown.

[0090] figure 2 The reference voltage generating circuit, included in the figure 1 The illustrated first capacitor 1 , second and third capacitors 2 and 3 are connected in series to form a capacitor row 4 and a voltage-current conversion circuit C. It further includes a gate-cathode transistor m5 as a unidirectional conduction element that can only pass current in one direction, an NMOS source follower transistor m6 as a buffer circuit, a PMOS transistor m8 connected in parallel with the first capacitor 1 as a first reset circuit, PMOS transistors m9 and m10 as second reset circuits are connected in parallel with the second and third capacitors 2 and 3, respectively.

[0091] The voltage-to-current conversion circuit C is biased by a bias current source Io, and is composed of a differential circuit composed of source-conn...

no. 3 Embodiment approach

[0097] image 3 The reference voltage generating circuit of the inventions 7, 8, and 9 according to the third embodiment is shown. In the present embodiment, a voltage generating circuit 5 is provided, and the voltage generating circuit 5 is used instead of the first capacitor 1 and the switch SW1 of the above-described first embodiment.

[0098] That is, the reference voltage generating circuit in the figure includes a capacitor row 4 in which two capacitors 2 and 3 are connected in series, two switches SW2 and SW3 connected in parallel with the capacitors 2 and 3, a voltage-current conversion circuit VIC, and A voltage generating circuit 5 that generates a given voltage. The output terminal of the voltage generating circuit 5 is connected to one end of the capacitor 2 of the capacitor array 4 described above. The voltage of the connection node B of the two capacitors 2 and 3 of the capacitor row 4 is output as the reference voltage Vref. Also in the present embodiment, si...

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Abstract

The invention provides a voltage amplifier that can amplify input signals having a variety of signal amplitudes to a constant amplitude by using the reference voltage generating circuit with excellent high-speed response. In a reference voltage generating circuit, in a first period, only a first switch is OFF and a maximum peak value Vmax of an input signal In is held at a node A of a first capacitor 1. Next, in a second period, a second and a third switches are opened, and a voltage difference between the maximum peak value Vmax and a minimum peak value Vmin is held at a node C of a capacitor string. At this time, the voltage held in a second capacitor of the capacitor string is added to the voltage held in the first capacitor, and the voltage at a node B is output as a reference voltage Vref. The input signal In is applied to one input terminal of a differential amplifying circuit, and the reference voltage Vref is applied to the other input terminal. When the voltages held at the nodes A and C have stabilized, the reference voltage Vref is generated.

Description

technical field [0001] The present invention relates to an optical communication system such as a PDS (Passive Double Star) optical subscriber system, in which a current output from a photodiode receiving an optical signal of an optical fiber is converted into a voltage signal, and a signal having various signal amplitudes is converted into a voltage signal. A voltage amplifier that amplifies the input signal to a certain amplitude. Background technique [0002] Recently, research on optical joiner systems has been widely carried out for the future FTTH (Fiber To The Home). However, the introduction of an optical fiber having a huge transmission capacity to a general household has an economical problem compared with the metal wire of the prior art. Among them, a PDS optical subscriber system that allows multiple subscribers to perform bidirectional communication services by branching an optical fiber from the base station side is expected to solve such economic problems. ...

Claims

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Application Information

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IPC IPC(8): H03K5/08H03F1/02H03F3/45H03F3/68
CPCH03F3/45762H03F3/45986
Inventor 木村博
Owner SOCIONEXT INC
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