Differential to single-ended logic converter
First Claim
1. A converter stage for converting a differential logic input signal and a corresponding common mode differential logic signal each having a first single-ended logic signal and a complementary second single-ended logic signal to a single-ended logic output signal comprising:
- (a) a first differential stage having a first PMOS transistor and a second PMOS transistor wherein the gate terminal of the first PMOS transistor is coupled to the first single-ended signal of the common mode level differential signal, wherein the gate terminal of the second PMOS transistor is coupled to the second single-ended signal of the common mode level differential signal, and wherein the source terminals of the PMOS transistors are connected to a first current source;
(b) a second differential stage having a first NMOS transistor and a second NMOS transistor wherein the gate terminal of the first NMOS transistor is coupled to the first single-ended signal of the differential input signal, wherein the gate terminal of the second NMOS transistor is coupled to the second single-ended signal of the differential input signal, and wherein the source terminals of the NMOS transistors are connected to a second current source, and wherein the drain terminals of the NMOS transistors are connected to the drain terminals of the PMOS transistors;
(c) an output connected to the source terminal of the second PMOS transistor and to the drain terminal of the second NMOS transistor for providing the single-ended output signal; and
(d) wherein the current sources are controlled by a voltage level that is centered between the mid-potentials of the common mode level differential logic signal and the mid-potential of the differential logic input signal such that both current sources deliver the same constant current.
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Abstract
The present invention is a converter stage for converting a differential logic input signal and a corresponding common mode differential logic signal each having a first single-ended logic signal and a complementary second single-ended logic signal into a single-ended logic output signal. The converter stage comprises a first and a second differential stage each having a first and a second MOS transistor and a first and second current source for the differential stages. According to the invention the current sources are controlled by the voltage level which is centered between the mid-potentials of the common mode level differential logic signal and the mid-potential of the differential logic input signal.
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Citations
16 Claims
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1. A converter stage for converting a differential logic input signal and a corresponding common mode differential logic signal each having a first single-ended logic signal and a complementary second single-ended logic signal to a single-ended logic output signal comprising:
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(a) a first differential stage having a first PMOS transistor and a second PMOS transistor wherein the gate terminal of the first PMOS transistor is coupled to the first single-ended signal of the common mode level differential signal, wherein the gate terminal of the second PMOS transistor is coupled to the second single-ended signal of the common mode level differential signal, and wherein the source terminals of the PMOS transistors are connected to a first current source;
(b) a second differential stage having a first NMOS transistor and a second NMOS transistor wherein the gate terminal of the first NMOS transistor is coupled to the first single-ended signal of the differential input signal, wherein the gate terminal of the second NMOS transistor is coupled to the second single-ended signal of the differential input signal, and wherein the source terminals of the NMOS transistors are connected to a second current source, and wherein the drain terminals of the NMOS transistors are connected to the drain terminals of the PMOS transistors;
(c) an output connected to the source terminal of the second PMOS transistor and to the drain terminal of the second NMOS transistor for providing the single-ended output signal; and
(d) wherein the current sources are controlled by a voltage level that is centered between the mid-potentials of the common mode level differential logic signal and the mid-potential of the differential logic input signal such that both current sources deliver the same constant current. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A converter stage for converting a differential logic input signal and a corresponding common mode differential logic signal each having a first single-ended logic signal and a complementary second single-ended logic signal to a single-ended logic output signal comprising:
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(a) a first differential stage having a first PMOS transistor and a second PMOS transistor wherein the gate terminal of the first PMOS transistor is coupled to the first single-ended signal of the common mode level differential signal, wherein the gate terminal of the second PMOS transistor is coupled to the second single-ended signal of the common mode level differential signal, and wherein the source terminals of the PMOS transistors are connected to a first current source;
(b) a second differential stage having a first NMOS transistor and a second NMOS transistor wherein the gate terminal of the first NMOS transistor is coupled to the first single-ended signal of the differential input signal, wherein the gate terminal of the second NMOS transistor is coupled to the second single-ended signal of the differential input signal, and wherein the source terminals of the NMOS transistors are connected to a second current source, and wherein the drain terminals of the NMOS transistors are connected to the drain terminals of the PMOS transistors;
(c) an output connected to the source terminal of the second PMOS transistor and to the drain terminal of the second NMOS transistor for providing the single-ended output signal;
(d) wherein the current sources are controlled by a voltage level that is centered between the mid-potentials of the common mode level differential logic signal and the mid-potential of the differential logic input signal such that both current sources deliver the same constant current;
(e) a complementary output between the drain terminal of the first PMOS transistor and the connected drain terminal of the first NMOS transistor for providing an inverted single-ended output signal;
(f) a first pair of resistors connected in series between the gate terminal of the first PMOS transistor and the gate terminal of the second PMOS transistor; and
(g) a second pair of resistors connected in series between the gate terminal of the first NMOS transistor and the gate terminal of the second NMOS transistor.
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16. A converter stage for converting a differential logic input signal and a corresponding common mode differential logic signal each having a first single-ended logic signal and a complementary second single-ended logic signal to a single-ended logic output signal comprising:
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(a) a first differential stage having a first PMOS transistor and a second PMOS transistor wherein the gate terminal of the first PMOS transistor is coupled to the first single-ended signal of the common mode level differential signal, wherein the gate terminal of the second PMOS transistor is coupled to the second single-ended signal of the common mode level differential signal, and wherein the source terminals of the PMOS transistors are connected to a first current source;
(b) a second differential stage having a first NMOS transistor and a second NMOS transistor wherein the gate terminal of the first NMOS transistor is coupled to the first single-ended signal of the differential input signal, wherein the gate terminal of the second NMOS transistor is coupled to the second single-ended signal of the differential input signal, and wherein the source terminals of the NMOS transistors are connected to a second current source, and wherein the drain terminals of the NMOS transistors are connected to the drain terminals of the PMOS transistors;
(c) an output connected to the source terminal of the second PMOS transistor and to the drain terminal of the second NMOS transistor for providing the single-ended output signal;
(d) wherein the current sources are controlled by a voltage level that is centered between the mid-potentials of the common mode level differential logic signal and the mid-potential of the differential logic input signal such that both current sources deliver the same constant current;
(e) a complementary output between the drain terminal of the first PMOS transistor and the connected drain terminal of the first NMOS transistor for providing an Inverted single-ended output signal;
(f) a pair of NMOS transistors the source-drain paths being connected between the gate terminal of the first PMOS transistor and the gate terminal of the second PMOS transistor and the gate terminals of the pair-NMOS transistors being connected to a supply voltage (VDD); and
(g) a pair of PMOS transistors the source-drain paths being connected between the gate terminal of the first NMOS transistor and the gate terminal of the second NMOS transistor and the gate terminals of the pair-PMOS transistors being connected to ground potential.
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Specification