An input stage for a log-domain integrator comprising a positive half for generating a positive compressed input voltage and a negative half for generating a negative compressed input voltage, said positive and said negative half of said input stage each comprising:
- a first dc voltage;
- a reference voltage;
- a ground;
- a linear Voltage-to-Current Converter;
- one of a positive uncompressed input voltage and a negative uncompressed input voltage;
- a fifteenth current source, a sixteenth current source, a seventeenth current source, an eighteenth current source, a nineteenth current source;
- a sixteenth transistor, a seventeenth transistor, an eighteenth transistor, a nineteenth transistor, a twentieth transistor, a twenty-first transistor, a twenty-second transistor, a twenty-third transistor, a twenty-fourth transistor, a twenty-fifth transistor;
- wherein said first dc voltage, said reference voltage, said ground and said one of a positive uncompressed input voltage and a negative uncompressed input voltage are connected to said linear Voltage-to-Current Converter;
- wherein a first output of said linear Voltage-to-Current Converter is connected to a base of said seventeenth transistor, a base of said twentieth transistor, a base of said twenty-third transistor;
- wherein a second output of said linear Voltage-to-Current Converter is connected to an emitter of said sixteenth transistor, a collector of said seventeenth transistor;
- wherein said first dc voltage is connected to a base of said nineteenth transistor and a base of said twenty-first transistor;
- wherein said reference voltage is connected to a collector of said sixteenth transistor, an input of said fifteenth current source, a collector of said eighteenth transistor, an input of said seventeenth current source, a collector of said twenty-second transistor, an input of said nineteenth current source;
- wherein said ground is connected to an emitter of said seventeenth transistor, an emitter of said twentieth transistor, an emitter of said twenty-third transistor, an emitter of said twenty-fifth transistor, an output of said sixteenth current source, an output of said eighteenth current source;
- wherein an output of said fifteenth current source is connected to a collector of said eighteenth transistor, a base of said eighteenth transistor and a base of said sixteenth transistor;
- wherein an emitter of said eighteenth transistor is connected to an input of said sixteenth current source, an emitter of said eighteenth transistor and a collector of said twentieth transistor;
- wherein an output of said seventeenth current source is connected to a collector of said twenty-first transistor and a base of said twenty-fifth transistor;
- wherein an emitter of said twenty-first transistor is connected to an input of said eighteenth current source, an emitter of said twenty-second transistor, a collector of said twenty-third transistor;
- wherein an output of said nineteenth current source is connected to a collector of said twenty-fourth transistor, a base of said twenty-fourth transistor and a base of said twenty-second transistor;
- and
- wherein an emitter of said twenty-second transistor is connected to a corresponding one of said positive compressed input voltage and said negative compressed input voltage, respectively, and a collector of said twenty-fifth transistor.