Dynamic correction circuit for current source of current-steering digital-to-analog convertor

A technology of analog-to-analog converter and current steering number, applied in the field of dynamic correction circuit, can solve problems such as output harmonic distortion, output signal harmonic distortion, digital-to-analog converter waveform deviation, etc., to improve output characteristics, improve overall performance, The effect of accurate output value

A technology of analog-to-analog converter and current steering number, applied in the field of dynamic correction circuit, can solve problems such as output harmonic distortion, output signal harmonic distortion, digital-to-analog converter waveform deviation, etc., to improve output characteristics, improve overall performance, The effect of accurate output value

CN102013892AActive Publication Date: 2011-04-13SHANGHAI BEILING
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  • Dynamic correction circuit for current source of current-steering digital-to-analog convertor
  • Dynamic correction circuit for current source of current-steering digital-to-analog convertor
  • Dynamic correction circuit for current source of current-steering digital-to-analog convertor

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Embodiment Construction

[0024] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0025] see Figure 3 to Figure 5 , in this embodiment, take a 16-bit digital-to-analog converter as an example, and set its high bit to 5 bits; the 5-bit high bit current source generates a 31-bit code through encoding, so that 31 identical current source modules are required to be used by the thermometer The code controls the working state. Since the digital-to-analog converter cannot lose codes when it is working normally, 31 are required for normal operation. Then, a current source module must be taken out for calibration every time it works, so 32 current sources are required. Source modules: In this embodiment, the 32 groups of current source modules are respectively numbered as CSM1, CSM2...CSM31, and CSM32.

[0026] Each group of current source modules includes a first MOS transistor unit 1 and a second MOS transistor unit 2 connected ...

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Abstract

The invention relates to a dynamic correction circuit for the current source of a current-steering digital-to-analog convertor. The current source comprises multiple groups of current source modules, each current source module comprises a first MOS (metal oxide semiconductor) tube unit and a second MOS tube unit which are connected in series; the first MOS tube unit comprises a plurality of first MOS tubes connected in parallel, and the source electrodes and drain electrodes of the first MOS tubes are respectively connected to form the source electrode and drain electrode of the first MOS tube unit; the source electrode of the first MOS tube unit is connected with an external power supply; and the correction circuit is composed of a feedback control module as well as a correction MOS tube subunit, a capacitor and a switch which are arranged in each group of current source modules. The dynamic correction circuit is used for dynamically correcting the current source to stabilize the current source basically so as to obtain a digital-to-analog convertor with better properties.

Description

technical field [0001] The invention relates to an integrated circuit, in particular to a dynamic correction circuit for a current source of a digital-to-analog converter. Background technique [0002] In analog integrated circuits or in interface circuits, the digital-to-analog conversion module is a very common functional module used to convert digital signals into analog signals, especially in integrated circuits that have developed to the GHz level and have an accuracy of 14bit and above. At present, the main structure adopted is a digital-to-analog converter in the form of a current steering to realize the above functions. [0003] In the above-mentioned digital-to-analog converter with high-speed and high-precision current steering structure (especially with a precision above 14bit), the high-level current source is a key module, especially the size or deviation of the high-level current source will directly determine the amplitude change of the output signal , that i...

Claims

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Application Information

Patent Timeline
13 Apr 2011
Publication
CN102013892A
IPC
H03M1/10
Inventors
袁文师