US 12,149,239 B2
Switched current source circuits
Kenneth Stephen Hunt, Maidenhead (GB)
Assigned to SOCIONEXT INC., Kanagawa (JP)
Filed by Socionext Inc., Kanagawa (JP)
Filed on Jan. 3, 2023, as Appl. No. 18/149,421.
Claims priority of application No. 22152827 (EP), filed on Jan. 21, 2022.
Prior Publication US 2023/0238954 A1, Jul. 27, 2023
Int. Cl. H03K 17/687 (2006.01); H03K 17/06 (2006.01); H03K 19/08 (2006.01); H03M 1/66 (2006.01)
CPC H03K 17/687 (2013.01) [H03K 17/06 (2013.01); H03K 19/08 (2013.01); H03M 1/66 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A switched current source circuit, comprising:
first and second voltage source nodes;
a load;
a current source; and
capacitor switching circuitry comprising a load node, a capacitor and a plurality of switches configured, based on a control signal, to adopt a biasing configuration followed by an active configuration,
wherein:
in the biasing configuration, the load node is conductively connected to the second voltage source node to bias a voltage level at the load node, and the capacitor is connected so that it at least partly charges;
in the active configuration, the load node is conductively connected via the load to the first voltage source node, and via the capacitor to the current source to increase a potential difference between the first voltage source node and the load node,
said load comprises first and second loads; and
the capacitor switching circuitry is configured, in the active configuration, to conductively connect the load node to the first voltage source node via either the first load or the second load in dependence upon a data signal.