Interface circuit for driving fully-differential circuits
First Claim
1. An analog-to-digital converter (ADC) circuit including a fully-differential ADC and an interface circuit for driving the fully-differential ADC, the interface circuit being configured to receive a first input voltage and a second input voltage, and further configured to provide a first output voltage and a second output voltage, the interface circuit comprising:
- a first circuit configured to receive the first and second input voltages, and provide a voltage at an output of the first circuit;
the first circuit is configured to decrease the voltage at the output of the first circuit in response to an increase in an average value of the first and second input voltages;
a first network configured to receive the first input voltage and the voltage at the output of the first circuit, and further configured to provide the first output voltage;
the first network being characterized by a first impedance ratio; and
a second network configured to receive the second input voltage and the voltage at the output of the first circuit, and further configured to provide the second output voltage;
the second network being characterized by a second impedance ratio substantially matched to the first impedance ratio.
4 Assignments
0 Petitions
Accused Products
Abstract
An interface circuit for driving a fully-differential circuit has a first circuit configured to decrease the voltage at its output in response to an increase in an average value of first and second input voltages. A first network receives the first input voltage and the output voltage of the first circuit to provide a first output voltage for driving the fully-differential circuit. A second network receives the second input voltage and the output voltage of the first circuit to provide a second output voltage for driving the fully-differential circuit. An impedance ratio of the first network is substantially matched to an impedance ratio of the second network.
-
Citations
31 Claims
-
1. An analog-to-digital converter (ADC) circuit including a fully-differential ADC and an interface circuit for driving the fully-differential ADC, the interface circuit being configured to receive a first input voltage and a second input voltage, and further configured to provide a first output voltage and a second output voltage, the interface circuit comprising:
-
a first circuit configured to receive the first and second input voltages, and provide a voltage at an output of the first circuit;
the first circuit is configured to decrease the voltage at the output of the first circuit in response to an increase in an average value of the first and second input voltages;a first network configured to receive the first input voltage and the voltage at the output of the first circuit, and further configured to provide the first output voltage;
the first network being characterized by a first impedance ratio; anda second network configured to receive the second input voltage and the voltage at the output of the first circuit, and further configured to provide the second output voltage;
the second network being characterized by a second impedance ratio substantially matched to the first impedance ratio.
-
-
2. A method of driving a fully-differential circuit using an interface circuit having a first circuit and first and second networks coupled to the first circuit, the method comprising the steps of:
-
providing the first circuit with first and second input voltages, decreasing an output voltage of the first circuit in response to an increase in an average value of the first and second input voltages, supplying the first input voltage and the output voltage of the first circuit to the first network to produce a first output voltage for driving a first input of the fully-differential circuit, and supplying the second input voltage and the output voltage of the first circuit to the second network to produce a second output voltage for driving a second input of the fully-differential circuit, wherein an impedance ratio of the first network is substantially matched to an impedance ratio of the second network.
-
-
3. An interface circuit for driving a fully-differential circuit, the interface circuit being configured to receive a first input voltage and a second input voltage, and further configured to provide a first output voltage and a second output voltage, the interface circuit comprising:
-
a regulator circuit configured to receive the first and second input voltages, and provide a regulator voltage at an output of the regulator circuit;
the regulator circuit is configured to decrease the regulator voltage at the output of the regulator circuit in response to an increase in an average value of the first and second input voltages;a first network configured to receive the first input voltage and the regulator voltage, and further configured to provide the first output voltage;
the first network being characterized by a first impedance ratio; anda second network configured to receive the second input voltage and the regulator voltage, and further configured to provide the second output voltage;
the second network being characterized by a second impedance ratio substantially matched to the first impedance ratio. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
-
Specification