Supply invariant bandgap reference system
First Claim
1. An apparatus comprising:
- a bandgap reference circuit to generate one or more bandgap reference signals that are substantially invariant to at least changes in direct current values of a supply voltage of the bandgap reference circuit;
a current mirror, coupled to the bandgap reference circuit, to receive and mirror a control signal, wherein the control signal controls the one or more bandgap reference signals generated by the bandgap reference circuit; and
a proportional to absolute temperature reference signal generator coupled between the bandgap reference circuit and the current mirror to generate one or more proportional to absolute temperature currents from at least one of the bandgap reference signals, wherein the one or more proportional to absolute temperature currents are substantially invariant to at least changes in direct current values of the supply voltage of the bandgap reference circuit, and, during operation of the current mirror, bulk error currents exist in the current mirror and each proportional to absolute temperature current is substantially invariant to the bulk error currents in the current mirror.
1 Assignment
0 Petitions
Accused Products
Abstract
An electronic reference-signal generation system includes a supply invariant bandgap reference system that generates one or more bandgap reference signals that are substantially unaffected by bulk error currents. In at least one embodiment, the bandgap reference generates a substantially invariant bandgap reference signals for a range of direct current (DC) supply voltages. Additionally, in at least one embodiment, the bandgap reference system provides substantially invariant bandgap reference signals when the supply voltage varies due to alternating current (AC) voltages. In at least one embodiment, the bandgap reference system generates a bandgap reference voltage VBG, a “proportional to absolute temperature” (PTAT) current (“iPTAT”) and a “zero dependency on absolute temperature” (ZTAT) current (“iZTAT”) that are substantially unaffected by variations in the supply voltage and unaffected by a bulk error current.
-
Citations
32 Claims
-
1. An apparatus comprising:
-
a bandgap reference circuit to generate one or more bandgap reference signals that are substantially invariant to at least changes in direct current values of a supply voltage of the bandgap reference circuit; a current mirror, coupled to the bandgap reference circuit, to receive and mirror a control signal, wherein the control signal controls the one or more bandgap reference signals generated by the bandgap reference circuit; and a proportional to absolute temperature reference signal generator coupled between the bandgap reference circuit and the current mirror to generate one or more proportional to absolute temperature currents from at least one of the bandgap reference signals, wherein the one or more proportional to absolute temperature currents are substantially invariant to at least changes in direct current values of the supply voltage of the bandgap reference circuit, and, during operation of the current mirror, bulk error currents exist in the current mirror and each proportional to absolute temperature current is substantially invariant to the bulk error currents in the current mirror. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
-
-
15. A method comprising:
-
generating one or more bandgap reference signals that are substantially invariant to at least changes in direct current values of a supply voltage of the bandgap reference circuit; receiving a control signal; mirroring the control signal using a current mirror to control the one or more bandgap reference signals generated by the bandgap reference circuit; and generating one or more proportional to absolute temperature currents from at least one of the bandgap reference signals, wherein the one or more proportional to absolute temperature currents are substantially invariant to at least changes in direct current values of the supply voltage of the bandgap reference circuit and, when mirroring the control signal using a current mirror, bulk error currents exist in the current mirror and each proportional to absolute temperature current is substantially invariant to the bulk error currents in the current mirror. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
-
-
28. A system comprising:
-
a bandgap reference circuit to generate one or more bandgap reference signals that are substantially invariant to at least changes in direct current values of a supply voltage of the bandgap reference circuit, wherein the bandgap reference circuit includes first and second parallel current paths, each current path includes one or more diodes, and the total diode forward voltage reduction during operation of the bandgap reference circuit is different for the two paths; an operational amplifier having an inverting node coupled to the first parallel current path of the bandgap reference circuit and a non-inverting node coupled to the second parallel current path of the bandgap reference circuit, wherein the operational amplifier is configured to generate a control signal to maintain equal currents through the first and second parallel current paths of the bandgap reference circuit; a current mirror, coupled to the bandgap reference circuit, to receive and mirror the control signal; and a proportional to absolute temperature reference signal generator coupled between the bandgap reference circuit and the current mirror to generate one or more proportional to absolute temperature currents from at least one of the bandgap reference signals, wherein the one or more proportional to absolute temperature currents are substantially invariant to at least changes in direct current values of the supply voltage of the bandgap reference circuit, and, during operation of the current mirror, bulk error currents exist in the current mirror and each proportional to absolute temperature current is substantially invariant to the bulk error currents in the current mirror. - View Dependent Claims (29, 30, 31, 32)
-
Specification