摘要:
Full-bridge amplifier output stage (200) with (each side of bridge) two transistors (M1PSW, M2PSW) connected to the amplifier output (O1) and driven by the same terminal (DT1) of a bias circuit (210), one of which connected to a supply (VDD), the other one to another terminal (N1) of the bias circuit; and other two transistors (M1NSW, M2NSW) connected to the amplifier output and driven by the same terminal (DT2) of a second bias circuit (220), one of which connected to a second supply (GND), the other one to another terminal (N4) of the second bias circuit. For switching amplifier; to control the gate voltage of the output FETs in the ON-state, to maintain a controlled or constant rDS(on) of the FETs.
摘要:
An interface circuit (INT C ) is disclosed, adapted to connect a microphone circuit (MC D ) to a preamplifier (P A ), the microphone circuit (MC D ) comprising a microphone (3) and at least an output node (M O , M O ') and the preamplifier (P A ) comprising at least an input node (10, 10') adapted to be connected to said output node (M O , M O ') through said interface circuit (INT C ). The interface circuit (INT C ) comprises at least a decoupling capacitor (C DEC ) for DC decoupling said input node (10, 10') from said output node (M O , M O '), the decoupling capacitor (C DEC ) having a first end connected/connectable to said input node (10, 10') and a second end connected/connectable to said output node (M O , M O '). The interface circuit (INT C ) comprises at least one active circuit (UG AMP , UG AMP ') connected to the first end of the decoupling capacitor (C DEC ), adapted to operatively act as a resistance multiplier and having an equivalent resistance that together with the decoupling capacitor (C DEC ) defines a high-pass filter operatively connected / connectable between the microphone (3) and the preamplifier (P A ) .
摘要:
A single-ended to differential buffer circuit is (21,22) is disclosed, adapted to couple at least an input analog signal (Vin) to a receiving circuit (24). The buffer circuit (21,22) comprises an output section (22) comprising a differential amplifier (25) having a first (31) and a second (32) input, a first (41) and a second (42) output. The buffer circuit further comprises an input section (21) comprising a first (CS1) and a second (CS2) switched capacitor, each adapted to sample said input analog signal (Vin) and having a first side (p1',p2') and a second side (p1", p2"), the first sides (p1', p2') of the first and second switched capacitors being controllably connectable / disconnectable to/from said first (41) and second (42) outputs respectively. In the buffer circuit the second sides (p1",p2") of said first (CS1) and second (CS2) switched capacitors are controllably connectable/disconnectable to/from said first (31) and second (32) inputs of the differential amplifier (25) respectively. Moreover, in the buffer circuit the second sides (p1", p2") of the first and second switched capacitors (CS1,CS2) are controllably connectable/disconnectable to/from said second output (42) and said first output (41) respectively. A method (100) for coupling at least a single-ended input analog signal (V in ) to a receiving circuit (24) with differential inputs is also disclosed.
摘要:
The present disclosure relates to an electronic analog-to-digital conversion device (100) which comprises: - an analog-to-digital conversion block (101) having a first input (1) for receiving a voltage signal (Vout) to be converted on the basis of a reference voltage signal (V REF ) provided to a second input (2) of the same analog-to-digital conversion block (101); - an input block (102) having an input terminal (3) and an output terminal (4) connected to the first input (1) of the analog-to-digital conversion block (101). The input block (102) is arranged for processing an input voltage signal (Vin) applied to the input terminal (3) to generate the voltage signal (Vout) at the output terminal (4). The input block (102) comprises: - a first resistive network (103) operatively connected to both the input terminal (3) and the output terminal (4); - a second resistive network (104) connected between the output terminal (4) and a reference potential (GND). The input block (102) is characterized by comprising an active network (105) connected between an output node (5) of the first resistive network (103) and the output terminal (4). The active network (105) has a first input terminal (6) directly connected to the second input (2) of the analog-to-digital conversion block (101) for receiving the same reference voltage signal (V REF ) provided to the second input (2) so that the input voltage signal (Vin) is processed by the input block (102) on the basis of such reference voltage signal (V REF ).
摘要:
The invention relates to a two-stage operational amplifier (400) in class AB for driving a load (R LB , R LA ) comprising: - an input stage (401) comprising differential input terminals (I N , I P ) and a first differential output terminal (O1P) and a second differential output terminal (O1N); - an output stage (402) comprising a first output branch (403) and a second output branch (404); - a control circuit (405) comprising a first PMOS transistor (M BP2B ) connected in a current mirror configuration to a second PMOS transistor (M L2B ) of the first output branch (403), a first NMOS transistor (M BNB ) connected in series with the first PMOS transistor (M BP2B ), a third PMOS transistor (M BP2A ) connected in a current mirror configuration to a fourth PMOS transistor (M L2A ) of the second output branch (404), a second NMOS transistor (M BNA ) connected in series with the third PMOS transistor (M BP2A ).
摘要:
A low-noise reference voltages distribution circuit (10) is disclosed, comprising a multi-output voltage to current converter (V/I_Conv) adapted to receive an input reference voltage (V R ) for providing a plurality of output reference currents (I 1 ,...,I N ) to be converted into a plurality of local reference voltages (V O1 ,..., V ON ) at corresponding receiving circuits (LCR 1 ,...,LCR N ) adapted to be connected to said reference voltages distribution circuit (10). The multi-output voltage to current converter (V/I_Conv) comprises: - an input section (20) adapted to generate on the basis of said input reference voltage (V R ) a reference current (I 0 ), the input section (20) comprising a current mirror input transistor (M0E) having a voltage controlled input terminal (g 0E ); - an output section (50) comprising a plurality of current mirror output transistors (M01,...,M0N) each adapted to provide a corresponding output reference current of said plurality of reference currents (I 1 ,..., I N ), each of said current mirror output transistors (M01,...,M0N) comprising a voltage controlled input terminal (g 01 ,...,g 0N ), the output section (50) comprising a common input node (51) to which voltage controlled input terminals (g 01 ,...,g 0N ) of said current mirror output transistors (M01,...,M0N) are connected. The voltage to current converter (V/I_Conv) comprises a low-pass filter (30) having an input node (31) connected to said voltage controlled input terminal (g 0E ) of the current mirror input transistor (M0E) and an output node (33) connected to said common input node (51).
摘要:
A microphone preamplifier circuit (60) is described, adapted to be connected to a microphone circuit (MC D ), the microphone circuit (MC D ) comprising a microphone (3) and at least one output node (M o , M o '). The microphone preamplifier circuit (60) comprises a preamplifier (P A ) comprising: - at least one input node (10, 10') adapted to be connected to said output node (M o , Mo'); - an operational amplifier (OA) comprising at least one input (20,20') and at least one output (21, 21'); - at least one input DC decoupling capacitor (C D , C D' ) connected between said input node (10, 10') and said first input of the operational amplifier (20,20'); - at least one feedback capacitor (C 2A , C 2A ') connected between the input (20,20') and the output (21,'21) of the operational amplifier (OA) in order to set together with said input DC decoupling capacitor (C D , C D' ) a gain value of the preamplifier circuit (60); - a first (40, 40') and a second feed node (41, 41') adapted to be fed by a first (V CIMIN ) and a second (V CM ) bias voltage respectively. The preamplifier (P A ) further comprises at least one switched capacitor (C 2B , C 2B ') adapted to be selectively and alternatively connected under the control of a clock signal (CK): - between said input (20, 20') and said output (21, 21') of the operational amplifier (OA); and - between said first (40, 40') and said second (41, 41') feed node.