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Gain amplifier for linear programmable switch capacitance

A technology of gain amplifier and program switch, which is applied in amplifiers, amplifiers with semiconductor devices/discharge tubes, gain control, etc., to achieve the effects of saving costs, simplifying design, and reducing current consumption

Inactive Publication Date: 2009-01-28
HOLTEK SEMICON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the error is not large, there is still a disadvantage that the linear programmable switched capacitor gain amplifier needs at least one more gain stage (gain stage)

Method used

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  • Gain amplifier for linear programmable switch capacitance
  • Gain amplifier for linear programmable switch capacitance
  • Gain amplifier for linear programmable switch capacitance

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Embodiment Construction

[0053] see figure 1 , is the maximum effective bit gain adjustment graph, as shown in the figure, the present invention uses the concept of piecewise linear (piece-wise linear), and first cuts the whole gain curve (dB gain curve) linearly into 2 mSegment, where m represents the number of bits (bits) of the most significant bit (MSB), and the remaining n bits are the least significant bit (LSB), and the total number of bits N is m+n.

[0054] Generally, the implementation is divided into two gain stages, one of which is responsible for the MSB and the other for the LSB. However, such an approach will add an additional amplifier (OPAMP), which not only wastes area but also increases power consumption. Therefore, the present invention proposes a method for simultaneously realizing the linear gain adjustment (dB-linear gain adjustment) of MSB and LSB in the same gain stage.

[0055] Since the LSB is a relatively small part of the code, we know that when x→0, e x ≈1+x, which me...

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Abstract

The invention discloses a linear programmable switched capacitor gain amplifier. With the piecewise-linear concept, firstly, the whole gain curve is cut into a plurality of sections linearly; and then the linear gain adjustment of MSB and LSB is realized in the same gain stage. The linear programmable switched capacitor gain amplifier realizes the linearization by setting the sampling capacitor array, keeping each capacitor value in the capacitor array, matching the switch of the capacitor switch, sampling the capacitor array, and keeping the arrangement of the capacitor array; moreover, the function of the whole programmable gain amplification can be realized in the same stage, thereby not only simplifying the design, saving the cost, reducing the consumption of current, and being suitable for the expendability and carrying device.

Description

technical field [0001] The invention relates to a gain amplifier, in particular to a linear programmable switch capacitor gain amplifier. Background technique [0002] Generally, the more commonly used linear programmable switched capacitor gain amplifier will be to approximate. In the case of an application with a large adjustment range and high accuracy, the entire linear programmable switched capacitor gain amplifier will be divided into two or several sections to complete. Such as Figure 7 As shown, it is the structural diagram of the prior art to complete the linear programmable switched capacitor gain amplifier in two stages, and Figure 8 As shown, it is a structural diagram of a linear programmable switched capacitor gain amplifier completed in several stages in the prior art. For the stage of the least significant bit (LSB, Least SignificantBit), generally an approximately linear To achieve 0~6dB, the maximum error is about -0.09dB. Such as Figure 9 As sho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/00H03F3/00
Inventor 陈议诚
Owner HOLTEK SEMICON
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