Current steering digital-to-analog converter and output amplitude control circuit
A digital-to-analog, output swing technology, applied in the field of current-directed digital-to-analog converters and their output swing control circuits, can solve the problem of affecting the output current of the current source, large second harmonic components, and reducing the current-directed digital converter. Analog converter output stability and other issues
Active Publication Date: 2016-02-24
上海兆芯集成电路股份有限公司
View PDF3 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0002] In a traditional current-steering digital-to-analog converter (CurrentSteeringDigital-to-AnalogConverter), if the swing of the input signal or output signal is too large, it may interfere with the bias voltage (BiasVoltage) of the current source through the parasitic capacitance (ParasiticCapacitance) of the transistor. ), thus affecting the output current of the current source
The main disadvantage of the traditional current-steering digital-to-analog converter is that the second harmonic component (Second Harmonic Component) in the output signal is very large, which reduces the output stability of the current-steering digital-to-analog converter
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0018] In order to make the purpose, features and advantages of the present invention more comprehensible, specific embodiments of the present invention are listed below, together with the attached drawings, for detailed description as follows.
[0019] figure 1 It is a schematic diagram showing a current steering digital-to-analog converter (Current Steering Digital-to-Analog Converter (DAC)) 100 according to an embodiment of the present invention. Such as figure 1 As shown, the current-steering digital-to-analog converter 100 includes: an output swing control circuit (OutputSwingControlCircuit) 110, a first transistor (Transistor) M1, a second transistor M2, a third transistor M3, a fourth transistor M4, and a first resistor R1 , a first operational amplifier (Operational Amplifier, OP) 120 , a fifth transistor M5 , and a current sink (CurrentSink) 130 . For example, the first transistor M1, the second transistor M2, the third transistor M3, the fourth transistor M4, and t...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention discloses a current steering digital-to-analog converter. The current steering digital-to-analog converter at least comprises multiple transistors, one operational amplifier and a resistor. The first transistor and the second transistor are coupled in series between supply potential and an internal node. The third transistor and the fourth transistor are coupled in parallel between the internal node and ground potential. The control ends of the third transistor and the fourth transistor are used for receiving anti-phase control signals and control signals. One end of the fourth transistor is provided with an output node. The resistor is coupled between the output node and the ground potential. The operational amplifier forms a single gain buffer. The output end of the single gain buffer is coupled to the control end of the second transistor. Such a design provided by the invention can reduce signal coupling and decreases second harmonic components output by the current steering digital-to-analog converter.
Description
technical field [0001] The present invention relates to a current-steering digital-to-analog converter (Current Steering Digital-to-Analog Converter), in particular to a current-steering digital-to-analog converter and its output swing control circuit (Output Swing Control Circuit). Background technique [0002] In a traditional current-steering digital-to-analog converter (CurrentSteeringDigital-to-AnalogConverter), if the swing of the input signal or output signal is too large, it may interfere with the bias voltage (BiasVoltage) of the current source through the parasitic capacitance (ParasiticCapacitance) of the transistor. ), thus affecting the output current of the current source. The main disadvantage of the traditional current-steering digital-to-analog converter is that the second harmonic component (Second Harmonic Component) in its output signal is very large, which reduces the output stability of the current-steering digital-to-analog converter. Therefore, it is...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More IPC IPC(8): H03M1/74
CPCH03M1/742
Inventor 邓玉林马新闻
Owner 上海兆芯集成电路股份有限公司