公开(公告)号：IT1250825B

公开(公告)日：1995-04-21

申请号：ITTO910599

申请日：1991-07-29

Applicant: ST MICROELECTRONICS SRL ,  MARELLI AUTRONICA

Inventor： MAZZUCCO MICHELANGELO ,  POLETTO VANNI ,  MORELLI MARCO

IPC: G01N27/409 ,  H03F3/45 ,  H03F

Abstract: In order to achieve a high input dynamic range as well as high CMRR and PSRR values and input impedance with the use of a single supply voltage (Vcc), the amplifier includes an input stage with two transistors (Q1, Q2) which are biased by a constant current (IP3, IP4), preferably of less than 1 microampere, and the collectors of the transistors (Q1, Q2) are kept at fixed reference voltages (VR1, VR2). The input signal (VIN) applied between the emitters (IN(-), IN(+)) of the transistors (Q1, Q2) is transferred to the terminals of a first resistor (R1) which is supplied with current (IR1) from a circuit (M7, A5, R3; M10, Q6, R4; M9, Q7, R5) which mirrors the current (IR1) into a second resistor (R6), from the terminals of which the output signal (VOUT) is taken. The preferred application is for forming interfaces for lambda probes fitted to catalytic converters for motor vehicles.

公开(公告)号：IT1251205B

公开(公告)日：1995-05-04

申请号：ITTO910707

申请日：1991-09-18

Applicant: ST MICROELECTRONICS SRL ,  MARELLI AUTRONICA

Inventor： POLETTO VANNI ,  MORELLI MARCO ,  POMA ALBERTO

IPC: H03K17/08 ,  H02M1/00 ,  H02M1/38 ,  H03K17/082 ,  H03K17/66 ,  H03K

Abstract: The circuit includes two output terminals (OUT1, OUT2) for connection to the terminals of a load (L), first and second pairs of electronic power switches (Q1, Q4; Q2, Q3) which are connected between the output terminals (OUT1, OUT2) and the two poles of a direct-current voltage supply (Vs) so as to form an H-shaped structure with the load (L), and a driver circuit (C1, C2) for selectively making the electronic power switches of the first pair (Q1, Q4) of the second pair (Q2, Q3) order to cause a current to flow through the load (L) in one direction or the other respectively, and for preventing the electronic switches (Q1, Q3; Q2, Q4) which are connected between the same output terminal (OUT1; OUT2) and the two poles of the voltage supply (Vs) from conducting simultaneously.