| 摘要 |
A low-noise reference voltages distribution circuit (10) is disclosed, comprising a multi-output voltage to current converter (V/I_Conv) adapted to receive an input reference voltage (VR) for providing a plurality of output reference currents (I1, . . . , IN) to be converted into a plurality of local reference voltages (V01, V0N) at corresponding receiving circuits (LCR1, LCRN) adapted to be connected to said reference voltages distribution circuit (10). The multi-output voltage to current converter (V/I_Conv) comprises: -an input section (20) adapted to generate on the basis of said input reference voltage (VR) a reference current (I0), the input section (20) comprising a current mirror input transistor (M0E) having a voltage controlled input terminal (g0E); -an output section (50) comprising a plurality of current mirror output transistors (M01, M0N) each adapted to provide a corresponding output reference current of said plurality of reference currents (I1, . . . , IN), each of said current mirror output transistors (M01, M0N) comprising a voltage controlled input terminal (g01, . . . , g0N), the output section (50) comprising a common input node (51) to which voltage controlled input terminals (g01, g0N) of said current mirror output transistors (M01, M0N) are connected. The voltage to current converter (V/I_Conv) comprises a low-pass filter (30) having an input node (31) connected to said voltage controlled input terminal (g0E) of the current mirror input transistor (M0E) and an output node (33) connected to said common input node (51). |
| 主权项 |
1. Reference voltages distribution circuit comprising a multi-output voltage to current converter adapted to receive an input reference voltage for providing a plurality of output reference currents to be converted into a plurality of local reference voltages at corresponding receiving circuits adapted to be connected to said reference voltages distribution circuit, the multi-output voltage to current converter comprising:
an input section adapted to generate on the basis of the input reference voltage a reference current, the input section comprising a current mirror input transistor having a voltage controlled input terminal; an output section comprising a plurality of current mirror output transistors each adapted to provide a corresponding output reference current of the plurality of output reference currents, each of said current mirror output transistors comprising a voltage controlled input terminal, the output section comprising a common input node to which voltage controlled input terminals of the current mirror output transistors are connected; wherein the reference voltages distribution circuit further comprises a low-pass filter having an input node connected to the voltage controlled input terminal of the current mirror input transistor and an output node connected to the common input node of the output section, said low pass filter comprising: a first MOS transistor having a first terminal connected to the input node of the low-pass-filter, a second terminal connected to the output node of the low-pass filter, and a gate terminal; a biasing circuit of said first MOS transistor adapted to apply to said gate terminal a DC control voltage such that the first MOS transistor operates in a weak inversion or sub-threshold region, wherein said control voltage is such to provide a desired resistance value R between said first terminal and said second terminal of the first MOS transistor. |
