公开(公告)号：SG23095G

公开(公告)日：1995-08-18

申请号：SG23095

申请日：1995-02-11

Applicant: MOTOROLA INC

Inventor： SMITH MICHAEL ,  WHATLEY ROGER A ,  OLESIN ANDREW S

IPC: H03K19/0175 ,  H03K19/0185 ,  H03K19/094 ,  H03K19/092

Abstract: An input buffer circuit having a single input for receiving input voltages characterized by having varying voltage swings is provided. First and second inverter circuits having differing switchpoint voltages are coupled to a level shifting position. The level shifting portion varies the level of swing of the input voltage and buffers the input voltage. In one form, voltage coupling circuitry is interposed between the level shifting portion and a latching portion which provides the input voltage as an output signal at a predetermined voltage level. In another form, voltage coupling circuitry controlled by control circuitry couples the output of the level shifting portion to an output in response to the input voltage.

公开(公告)号：HK17289A

公开(公告)日：1989-03-10

申请号：HK17289

申请日：1989-03-02

Applicant: MOTOROLA INC

Inventor： ULMER RICHARD WALTER ,  WHATLEY ROGER A

IPC: H03K3/26

公开(公告)号：HK103188A

公开(公告)日：1988-12-30

申请号：HK103188

申请日：1988-12-22

Applicant: MOTOROLA INC

Inventor： KELLEY STEPHEN HARLOW ,  ULMER RICHARD WALTER ,  WHATLEY ROGER A

IPC: H03F1/02

公开(公告)号：DE3270199D1

公开(公告)日：1986-05-07

申请号：DE3270199

申请日：1982-01-25

Applicant: MOTOROLA INC

Inventor： KELLEY STEPHEN HARLOW ,  ULMER RICHARD WALTER ,  WHATLEY ROGER A

IPC: H03F3/34 ,  H03F1/30 ,  H03F1/02

Abstract: A temperature stable bandgap voltage reference source utilizing bipolar transistors biased at different emitter current densities is provided. Switched capacitors are used to input the Vbe and the DELTA Vbe of the transistors (PTC and NTC voltages, respectively,) into an operational amplifier to provide a reference voltage proportional to the sum of the PTC and NTC voltages. Proper selection of the ratio of the switched capacitors renders the reference voltage substantially independent of temperature. In a modified form of the reference, the reference amplifier is implemented by an auto-zeroed operational amplifier which uses switched capacitor techniques and an integrated capacitor to achieve the auto-zeroing function.

公开(公告)号：CA1159523A

公开(公告)日：1983-12-27

申请号：CA393980

申请日：1982-01-12

Applicant: MOTOROLA INC

Inventor： KELLEY STEPHEN H ,  ULMER RICHARD W ,  WHATLEY ROGER A

IPC: H03F3/34 ,  H03F1/30 ,  H03F1/14 ,  H03F1/34

Abstract: AUTO-ZEROING OPERATIONAL AMPLIFIER CIRCUIT A temperature stable bandgap voltage reference source utilizing bipolar transistors 12 and 14 biased at different emitter current densities is provided. Switched capacitors 28 and 34 are used to input the Vbe and the .DELTA.Vbe of the transistors 12 and 14 (PTC and NTC voltages, respectively,) into an operational amplifier 42 to provide a reference voltage VREF Proportional to the sum of he PTC and NTC voltages. Proper selection of the ratio of the switched capacitors 28 and 34 renders the reference voltage VREF substantially independent of temperature. In a modified form of the reference source 10, the reference amplifier 22 is implemented by an auto-zeroed operational amplifier 42 which uses switched capacitor techniques and an integrated capacitor 44 to achieve the auto-zeroing function.

公开(公告)号：EP0070882A4

公开(公告)日：1983-05-16

申请号：EP82900751

申请日：1982-01-25

Applicant: MOTOROLA INC

Inventor： KELLEY STEPHEN HARLOW ,  ULMER RICHARD WALTER ,  WHATLEY ROGER A

IPC: H03F3/34 ,  H03F1/30 ,  H03F1/02

CPC classification number: H03F1/303

公开(公告)号：EP0164360A4

公开(公告)日：1987-04-29

申请号：EP84903700

申请日：1984-09-27

Applicant: MOTOROLA INC

Inventor： SMITH MICHAEL D ,  WHATLEY ROGER A ,  OLESIN ANDREW S

IPC: H03K19/0175 ,  H03K19/0185 ,  H03K19/094 ,  H03K19/092

CPC classification number: H03K19/017518 ,  H03K19/018521 ,  H03K19/09425

公开(公告)号：EP0066572A4

公开(公告)日：1983-04-18

申请号：EP81902936

申请日：1981-10-28

Applicant: MOTOROLA INC

Inventor： WHATLEY ROGER A

IPC: H03F1/32 ,  H03F3/20 ,  H03F3/213 ,  H03F3/30

CPC classification number: H03F3/45179 ,  H03F1/3205 ,  H03F3/3008 ,  H03F2203/30021 ,  H03F2203/45224

公开(公告)号：EP0070315A4

公开(公告)日：1983-06-17

申请号：EP82900750

申请日：1982-01-25

Applicant: MOTOROLA INC

Inventor： ULMER RICHARD WALTER ,  WHATLEY ROGER A

IPC: G05F1/56 ,  G05F3/30 ,  H03K3/26

CPC classification number: G05F3/30

公开(公告)号：WO1982002806A1

公开(公告)日：1982-08-19

申请号：PCT/US1982000093

申请日：1982-01-25

Applicant: MOTOROLA INC

Inventor： MOTOROLA INC ,  ULMER RICHARD WALTER ,  WHATLEY ROGER A

IPC: H03K03/26

CPC classification number: G05F3/30

Abstract: Une source de tension de reference a espace inter-bandes independante de la temperature utilise deux transistors de substrat bi-polaire (12 et 14) polarises a des densites de courants emetteurs differentes. Des condensateurs commutes (28 et 34) sont utilises pour entrer Vbe et (Alpha)Vbe des transistors (12 et 14) (tensions NTC et PTC, respectivement) dans un amplificateur (42) pour obtenir une tension de reference VREF proportionnelle a la somme ponderee des tensions PTC et NTC. La selection appropriee du rapport des condensateurs commutes (28 et 34) rend la tension de refere VREF sensiblement independante de la temperature. Dans une forme modifiee de la reference (10) l'amplificateur de reference (22) est actionne par un amplificateur operationnel a auto-zero (42) qui utilise les techniques de condensateurs commutes et un condensateur integre (44) pour effectuer la fonction de remise a zero.