Multiplying digital-to-analog converter
a digital-to-analog converter and converter technology, applied in the field of multi-channel digital-to-analog converter, can solve the problems of system still needing to operate at high speed, capacitor block may not be able to correctly sample input signal,
Inactive Publication Date: 2010-06-24
MEDIATEK INC
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- Application Information
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Benefits of technology
[0005]One of the objectives of the present invention is therefore to provide a high-speed low supply voltage multiplying analog-to-digital converter (MDAC).
[0006]According to an embodiment of the present invention, a multiplying digital-to-analog converter (MDAC) is disclosed. The MDAC comprises an operational amplifier (OP-amp), an OP-amp input switch block, a capacitor block, a sampling switch block, a reference voltage switch block, and a feedback switch block. The operational amplifier (OP-amp) operates under a first power supply voltage and a second power supply voltage, wherein the first power supply voltage is higher than the second power supply voltage. The OP-amp input switch block is coupled to a common mode voltage for selectively coupling the common mode voltage to input nodes of the OP-amp, wherein all switches included in the OP-amp input switch blo
Problems solved by technology
If this is the case, the capacitor block may not be able to sample the input signal correctly.
It is very difficult, however, to design an input stage biased at VDD / 2 when the VDD is the low supply voltage but the system still needs to operate at high speed.
Therefore, designing a pipeline ADC that operates under a low supply voltage but at a high operating speed is a current challenge in the field.
Method used
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[0013]Certain terms are used throughout the following description and claims, which refer to particular components. As one skilled in the art will appreciate, electronic equipment manufacturers may refer to a component by different names. This document does not intend to distinguish between components that differ in name but not in function. In the following description and in the claims, the terms “include” and “comprise” are used in an open-ended fashion, and thus should be interpreted to mean “include, but not limited to . . . ”. Also, the term “couple” is intended to mean either an indirect or direct electrical connection. Accordingly, if one device is coupled to another device, that connection may be through a direct electrical connection, or through an indirect electrical connection via other devices and connections.
[0014]Please refer to FIG. 3. FIG. 3 is a diagram illustrating a multiplying digital-to-analog converter (MDAC) 300 according to an embodiment of the present inven...
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A multiplying digital-to-analog converter includes an operational amplifier (OP-amp) operated under a first power supply voltage and a second power supply voltage; an OP-amp input switch block coupled to a common mode voltage for selectively coupling the common mode voltage to input nodes of the OP-amp, wherein all switches included in the OP-amp input switch block are implemented utilizing PMOS transistors only, and the common mode voltage is substantially equal to the first power supply voltage; a capacitor block coupled to the OP-amp input switch block; a sampling switch block coupled to the input signal for selectively coupling the input signal to the capacitor block; a reference voltage switch block coupled to the capacitor block for selectively coupling the reference signal to the capacitor block; and a feedback switch block coupled between the capacitor block and output nodes of the OP-amp.
Description
BACKGROUND[0001]The present invention relates to a multiplying digital-to-analog converter (MDAC), and more particularly, to a high-speed low supply voltage MDAC.[0002]In the field of analog-to-digital converter (ADC), a pipeline ADC is commonly employed in high speed and high-resolution analog-to-digital converting operations. One of the most important blocks in the pipeline ADC is the MDAC (Multiplying digital-to-analog converter). Conventionally, there are a plurality of MDACs in the pipeline ADC, and each MDAC is responsible for generating a residue for use in the MDAC in next stage. Furthermore, the MDAC normally consists of an operational amplifier, a capacitor block, and a switching block, wherein the capacitor block is utilized to sample an input signal for assisting the switching block, and the operational amplifier outputs the residue between the input signal and an output bit of a subADC of the pipeline ADC to the next MDAC.[0003]According to prior art, the common mode vo...
Claims
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Login to View More IPC IPC(8): H03M1/66
CPCH03M1/66
Inventor TU, WEI-HSUANKANG, TZUNG-HUNG
Owner MEDIATEK INC