Complementary high voltage switched current source integrated circuit

Abstract

A complementary high voltage switched current source circuit has a complementary current source pair, wherein a first of the current source pair is coupled to a positive voltage rail and a second of the current source pair is coupled to a negative voltage rail. A digital logic-level control interface circuit is coupled to the complementary current source pair and to the positive voltage rail and the negative voltage rail. A pair of high voltage switches is coupled to the complementary current source pair and the digital logic-level control interface circuit and controlled by the digital control interface circuit.

1 . A complementary high voltage switched current source circuit comprising:
 a complementary current source pair;   a digital logic-level control interface circuit coupled to the complementary current source pair and to a positive voltage rail and a negative voltage rail; and   a pair of high voltage switches coupled to the a complementary current source pair, the digital logic-level control interface circuit and controlled by the digital control interface circuit.   
     
     
         2 . A complementary high voltage switched current source circuit in accordance with  claim 1  further comprising a plurality of multi-channel high voltage switched current sources coupled together. 
     
     
         3 . A complementary high voltage switched current source circuit in accordance with  claim 1  wherein the complementary current source pairs are approximately matched for generating low harmonic waveform for one of ultrasound image system or Class-D audio applications. 
     
     
         4 . A complementary high voltage switched current source circuit in accordance with  claim 1  wherein the complementary current source pair comprises:
 a pair of P-type MOSFETs coupled to the digital logic-level control interface circuit and to the high voltage switches; and 
 a pair of N-type MOSFETs coupled to the digital logic-level control interface circuit and to the high voltage switches. 
 
     
     
         5 . A complementary high voltage switched current source circuit in accordance with  claim 1  wherein the complementary current source pair comprises:
 a first P-type MOSFET coupled to the digital logic-level control interface circuit and to the high voltage switches; 
 a first N-type MOSFET coupled to the first P-type MOSFET, to the digital logic-level control interface circuit, and to a first high voltage switch; 
 a second P-type MOSFET coupled to the digital logic-level control interface circuit and to the high voltage switches; and 
 a second N-type MOSFET coupled to the second P-type MOSFET, to the digital logic-level control interface circuit, and to a second high voltage switch. 
 
     
     
         6 . A complementary high voltage switched current source circuit in accordance with  claim 5  wherein the digital logic-level control input circuit comprises:
 a pair of capacitive elements, wherein a first of the pair of capacitive elements is coupled to a first control waveform and to the first N-type MOSFET, and a second of the pair of capacitive elements is coupled to a second control waveform and to the second N-type MOSFET; 
 a pair of Zener diodes, wherein a first of the pair of Zener diodes is attached to the first control waveform, to the first N-type MOSFET, and to the positive voltage rail and a second of the pair of Zener diodes attached to the second control waveform, to the second N-type MOSFET, and to the negative voltage rail; 
 a first pair of resistive elements, wherein a first of the first pair of resistive element is in parallel with the first Zener diode, and a second of the first pair of resistive element is in parallel with the second Zener diode; 
 a second pair of resistive elements, wherein a first of the second pair of resistive element is coupled to the first P-type MOSFET and the first N-type MOSFET, and a second of the second pair of resistive element is coupled to the second P-type MOSFET and the second N-type MOSFET; and 
 a pair of switching diodes, wherein a first of the pair of switching diodes is coupled to the first of the second pair of resistors and to the first P-type MOSFET, and s second of the pair of switching diodes is coupled to the second of the second pair of resistors and to the second P-type MOSFET. 
 
     
     
         7 . A complementary high voltage switched current source circuit comprising:
 a complementary current source pair;   a digital logic-level control interface circuit coupled to the complementary current source pair and to a positive voltage rail and a negative voltage rail; and   a pair of high voltage switches coupled to the a complementary current source pair, the digital logic-level control interface circuit and controlled by the digital control interface circuit;   wherein the complementary current source pair comprises:   a first P-type MOSFET coupled to the digital logic-level control interface circuit and to the high voltage switches;   a first N-type MOSFET coupled to the first P-type MOSFET, to the digital logic-level control interface circuit, and to a first high voltage switch;   a second P-type MOSFET coupled to the digital logic-level control interface circuit and to the high voltage switches; and   a second N-type MOSFET coupled to the second P-type MOSFET, to the digital logic-level control interface circuit, and to a second high voltage switch.   
     
     
         8 . A complementary high voltage switched current source circuit in accordance with  claim 7  further comprising a plurality of multi-channel high voltage switched current sources coupled together. 
     
     
         9 . A complementary high voltage switched current source circuit in accordance with  claim 7  wherein the complementary current source pairs are approximately matched for generating low harmonic waveform for one of ultrasound image system or Class-D audio applications. 
     
     
         10 . A complementary high voltage switched current source circuit in accordance with  claim 7  wherein the complementary current source pair comprises:
 a first P-type MOSFET coupled to the digital logic-level control interface circuit and to the high voltage switches; 
 a first N-type MOSFET coupled to the first P-type MOSFET, to the digital logic-level control interface circuit, and to a first high voltage switch; 
 a second P-type MOSFET coupled to the digital logic-level control interface circuit and to the high voltage switches; and 
 a second N-type MOSFET coupled to the second P-type MOSFET, to the digital logic-level control interface circuit, and to a second high voltage switch. 
 
     
     
         11 . A complementary high voltage switched current source circuit in accordance with  claim 7  wherein the digital logic-level control input circuit comprises:
 a pair of capacitive elements, wherein a first of the pair of capacitive elements is coupled to a first control waveform and to the first N-type MOSFET, and a second of the pair of capacitive elements is coupled to a second control waveform and to the second N-type MOSFET; 
 a pair of Zener diodes, wherein a first of the pair of Zener diodes is attached to the first control waveform, to the first N-type MOSFET, and to the positive voltage rail and a second of the pair of Zener diodes attached to the second control waveform, to the second N-type MOSFET, and to the negative voltage rail; 
 a first pair of resistive elements, wherein a first of the first pair of resistive element is in parallel with the first Zener diode, and a second of the first pair of resistive element is in parallel with the second Zener diode; 
 a second pair of resistive elements, wherein a first of the second pair of resistive element is coupled to the first P-type MOSFET and the first N-type MOSFET, and a second of the second pair of resistive element is coupled to the second P-type MOSFET and the second N-type MOSFET; and 
 a pair of switching diodes, wherein a first of the pair of switching diodes is coupled to the first of the second pair of resistors and to the first P-type MOSFET, and s second of the pair of switching diodes is coupled to the second of the second pair of resistors and to the second P-type MOSFET.