US 12,149,048 B2
Configurable high-frequency pulsed laser diode driver capacitor refresh circuit
Joseph H. Colles, Bonsall, CA (US); Steven E. Rosenbaum, San Diego, CA (US); and Stuart B. Molin, Carlsbad, CA (US)
Assigned to Silanna Asia Pte Ltd, Singapore (SG)
Filed by Silanna Asia Pte Ltd, Singapore (SG)
Filed on Dec. 21, 2023, as Appl. No. 18/392,406.
Application 18/392,406 is a continuation of application No. 17/653,349, filed on Mar. 3, 2022, granted, now 11,894,656.
Prior Publication US 2024/0146022 A1, May 2, 2024
Int. Cl. H01S 5/042 (2006.01); H03K 17/687 (2006.01); H03K 19/20 (2006.01)
CPC H01S 5/0428 (2013.01) [H03K 17/6871 (2013.01); H03K 19/20 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An apparatus comprising:
a refresh circuit configured to receive a DC input voltage and to provide a refresh current to a capacitor using the DC input voltage, wherein a current amplitude of the refresh current is controlled by the refresh circuit based on a voltage developed at the capacitor in response to the refresh current; and
wherein the refresh circuit comprises:
an attenuator circuit configured to generate a representative voltage signal based on the voltage developed at the capacitor;
a threshold voltage generator circuit configured to generate a plurality of threshold voltages based on a specified maximum target voltage that the capacitor should be charged to;
a plurality of comparators configured to generate a plurality of comparison signals based on respective comparisons of the representative voltage signal to the plurality of threshold voltages; and
a drive configuration circuit configured to receive the plurality of comparison signals and to control the amplitude of the refresh current based on the plurality of comparison signals.