Clean Startup and Power Saving in Pulsed Enabling of LDO
AssigneeDialog Semiconductor GmbH
InventorsAmbreesh Bhattad, Ludmil Nikolov
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Abstract
Circuits and methods to achieve a clean start-up process and power saving of pulsed enabled electronic devices having an output capacitor and components requiring biasing during normal operating conditions are disclosed. These electronic devices could be e.g. LDOs, amplifiers or buffers. A set of switches are enabling bias currents from the output capacitor to internal nodes requiring biasing under normal operational conditions as e.g. output nodes of amplifying means.
Claims31
A method to achieve a clean start-up process and power saving of pulsed enabled electronic devices having an output capacitor and components requiring biasing during normal operating conditions, comprising the following steps:
- (1) providing a pulsed enabled electronic device having an output capacitor and components requiring biasing;
- and
- (2) biasing internal nodes of the device from the output capacitor during power down of the electronic device;
- and
- (3) using the energy stored in the output capacitor for the next process of the electronic device.
A circuit to achieve a clean start-up process and power saving of pulsed enabled electronic devices having an output capacitor and components requiring biasing during normal operating conditions, comprising:
- a port for an enabling/disabling signal;
- and
- a set of switches configured to activate bias currents from the output capacitor to internal nodes of the electronic device requiring bias current under normal operating conditions, wherein the switches are controlled by said enabling/disabling signal.
A circuit to achieve a clean start-up process and power saving of pulsed enabled electronic devices having an output capacitor and components requiring biasing during normal operating conditions, comprising:
- an output capacitor;
- components of the electronic device requiring biasing during normal operating conditions;
- a port for an enabling/disabling signal;
- and
- a set of switches enabling bias current from the output capacitor to internal nodes of the electronic device requiring bias current under normal operating conditions, wherein the switches are controlled by said enabling/disabling signal.
A circuit to achieve a clean start-up process and power saving of a pulsed enabled LDO having an output capacitor and amplifying means requiring biasing during normal operating conditions, comprising:
- a port for an enabling/disabling signal of the LDO;
- an output capacitor;
- an error amplifier receiving a reference voltage and a fraction of the output voltage from a voltage divider and an output of the error amplifier is an input of an amplifying means;
- said amplifying means receiving input from said error amplifier;
- said voltage divider, connected between an output voltage of the LDO and ground;
- and
- a set of switches enabling bias current from the output capacitor to internal nodes of the electronic device requiring bias current under normal operating conditions, wherein the switches are controlled by said enabling/disabling signal.
Dependencies are inferred from the claim text.