A Segmented Current Source DAC Circuit
A segmented current and current source array technology, applied in the field of integrated circuits, can solve the problems of increased overall power consumption, high complexity of digital circuits, and increased complexity of circuit and chip layout, so as to improve performance, reduce chip area and Power Consumption, Effects of Reduced Complexity
Active Publication Date: 2016-08-03
EAST CHINA INST OF OPTOELECTRONICS INTEGRATEDDEVICE
View PDF3 Cites 2 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
The unit current source type current source DAC needs a thermometer decoder, and the complexity of the digital circuit increases. After the N-bit binary input code is converted into 2N-1 thermometer codes by the decoder, 2N-1 switches and 2N-1 The complexity of the current source, circuit and chip layout increases, the overall power consumption increases, and the noise interference generated by the digital circuit will also affect the performance of the analog circuit
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
[0043] Below in conjunction with accompanying drawing, the best implementation example of the present invention is described in further detail:
[0044] image 3 is a block diagram of a segmented current source DAC circuit, including:
[0045] a. The high five-bit current source array, set register 1, decoder 1 and latch 1 connected in sequence to connect with the high five-bit current source array;
[0046] b, the four-bit current source array in the middle, the register 2, the decoder 2 and the latch 2 connected in sequence are set to be connected to the four-bit current source array in the middle;
[0047] c, the low five-bit current source array, set the sequentially connected register 3, delay circuit and latch 3 to connect with the low five-bit current source array;
[0048] d. The reference voltage source is respectively connected to the high five-bit current source array, the middle four-bit current source array and the low five-bit current source array, and the refe...
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 relates to a DAC (Digital-to-Analog Converter) circuit of a segmented current source, which is combined by a binary weighting structure and a unit current source structure. The DAC circuit has the main advantages that through reasonably segmenting 14-site current type DAC, the complicate degree of the circuit (a current source and a coding part) is reduced, the area and power consumption of a chip are reduced, and meanwhile the performances of the DAC can be improved. In a DAC of the segmented current source structure, the reason that one part uses the binary weighting structure and the other parts uses the unit current source structure is that an MSB (Most Significant Bit) current source contributes greater to outputting burrs and requires higher to component matching, thus the MSB uses the unit current source structure, and an LSB (Least Significant Bit) uses the binary weighting structure to reduce area and power consumption.
Description
Technical field: [0001] The invention belongs to the field of integrated circuits and relates to a segmented current source DAC circuit. Background technique: [0002] Currently, there are three types of current source DAC structures that are widely used, namely binary weighted current source structure, unit current source type current source structure and segmented current source structure combining the first two structures. [0003] Binary-weighted current source DAC: [0004] as attached figure 1 As shown in (a), a current source DAC with a 4-bit binary weighted current source architecture includes four current sources, and the currents flowing through them are I, 2I, 4I and 8I respectively, and these current sources are respectively controlled by four digital signals B1 , B2, B3, B4 control. When B1 is at high level, current I is directed to the output terminal, when B2 is at high level, current 2I is directed to the output terminal, and so on. When all digital contr...
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 Patent Type & Authority Patents(China)
IPC IPC(8): H03M1/66
Inventor 刘德状周晓丹王俊祥
Owner EAST CHINA INST OF OPTOELECTRONICS INTEGRATEDDEVICE