(19)
(11) EP 2 256 580 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
Note: Bibliography reflects the latest situation

(15) Correction information:
Corrected version no 1 (W1 A2)

(48) Corrigendum issued on:
04.05.2011 Bulletin 2011/18

(43) Date of publication:
01.12.2010 Bulletin 2010/48

(21) Application number: 10005284.4

(22) Date of filing: 20.05.2010
(51) International Patent Classification (IPC): 
G05F 3/30(2006.01)
 H03F 3/38(2006.01)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR
Designated Extension States:
BA ME RS

(30) Priority: 22.05.2009 US 470932

(71) Applicant: Linear Technology Corporation
Milpitas, CA 95035-7417 (US)

(72) Inventor:
  • Consoer, Kelly Joel
    Tempe Arizona 85284 (US)

(74) Representative: Müller-Boré & Partner Patentanwälte 
Grafinger Straße 2
81671 München
81671 München (DE)

   


(54) Chopper stabilized bandgap reference circuit and methodology for voltage regulators


(57) A chopper stabilized bandgap voltage reference circuit comprises current mirror circuitry mirroring first and second currents into first and second networks to generate a forward diode voltage signal and a PTAT (proportional to absolute temperature) component signal, and a third current having a derived temperature coefficient into a third network to generate a reference voltage signal for a regulator. An amplifier amplifies a differential signal of the forward diode voltage signal and the PTAT component signal to output a fourth current to control the first and second currents. According to a chopper clock, a modulator modulates the differential signal to be supplied to the amplifier and a demodulator demodulates the fourth current. A gain loop compensation circuit is coupled to the demodulator to compensate the amplifier, and filter the fourth current for noise components, and a bypass circuit is also provided to the third network for filtering the third current.