| 摘要 |
<p>The present invention refers to a digital to analog conversion circuit able to transform an input digital signal having n bit in a signal having a thermometric code and to convert it in an analog output signal. In an embodiment the digital to analog conversion circuit able to transform a digital input signal (5) having n bit in an output analog signal (6) comprise: a thermometric decoder (60) having said digital input signal (5) in input and able to produce said signal (SW1-SW7) having a thermometric code with 2<n>-1 bit in output; a digital to analog converter (21, 31) with modular elements (C1-C7, R1-R7) including 2<n>-1 controlled switches (I1-I7); a shift register (61) able to receive said digital signal (T1-T7) having 2<n>-1 bit in an data input and able to produce 2<n>-1 control signals (SW1-SW7) of said controlled switches (I1-I7) in output; a delay circuit (62) of said of digital input signal (5) having the output connected to a shift input (64) of said shift register (61) and able to produce a delayed digital signal in output as to make said digital signal (T1-T7) having 2<n>-1 bit shift by a number of bit equal to the value of said delayed digital signal; characterised by further comprising a generator (91) of a digital random number selected in a range of prefixed values and having a prefixed probability of occurrence; an adder node (90) able to receive said random digital number and said delayed digital signal in input whose output is connected to said shift input (64) of said shift register (61). <IMAGE></p> |
