US 12,348,241 B2
Successive approximation analog-to-digital converter, analog-to-digital conversion method and device applying in the same
Yang Cheng, Hangzhou (CN)
Assigned to Joulwatt Technology Co., Ltd., Hangzhou (CN)
Filed by Joulwatt Technology Co., Ltd., Hangzhou (CN)
Filed on Mar. 31, 2023, as Appl. No. 18/129,100.
Claims priority of application No. 202210343099.X (CN), filed on Mar. 31, 2022.
Prior Publication US 2023/0318616 A1, Oct. 5, 2023
Int. Cl. H03M 1/38 (2006.01); H03M 1/46 (2006.01)
CPC H03M 1/466 (2013.01) 19 Claims
OG exemplary drawing
 
1. A successive approximation analog-to-digital converter, comprising a D/A conversion circuit, a comparator, and a logic control module, wherein
an input signal is sampled and held to obtain a sampling signal; the D/A conversion circuit receives the sampling signal and a reference voltage signal, and an output terminal of the D/A conversion circuit outputs a first voltage signal; the output terminal of the D/A conversion circuit is coupled to at least one input terminal of the comparator,
an output terminal of the comparator is coupled to an input terminal of the logic control module, and the logic control module controls the D/A conversion circuit to adjust the first voltage signal according to a comparison result of the comparator, and
when a number of comparison of the comparator reaches preset digits of the D/A conversion circuit, a data output terminal of the logic control module outputs a data signal corresponding to the input signal,
wherein the D/A conversion circuit comprises a unit capacitor and a capacitor array, wherein
a first terminal of the unit capacitor is connected to a reference ground terminal or to a connection terminal of the reference voltage signal through a single-pole double-throw switch,
the capacitor array comprises a plurality of capacitor banks, wherein each capacitor bank of the plurality of capacitor banks comprises two capacitors with equal capacitance values, and a first terminal of each capacitor in the capacitor array is switched to the reference ground terminal or to the connection terminal of the reference voltage signal through the single-pole double-throw switch connected in serial with the capacitor; at an initial moment, the first terminal of a first capacitor of the two capacitors in each capacitor bank is connected to the connection terminal of the reference voltage signal through the single-pole double-throw switch, and the first terminal of a second capacitor of the two capacitors in each capacitor bank is connected to the reference ground terminal through the single-pole double-throw switch, and
second terminals of the unit capacitor and the capacitor array are connected together to form a common connection terminal as the output terminal of the D/A conversion circuit.