Patent ID: 8638125

Claim:
An apparatus including a differential signal driver, comprising: first and second input electrodes to convey a differential input signal; differential current mode amplifier circuitry coupled to said first and second input electrodes and responsive to said differential input signal by providing a corresponding differential drive signal; current source circuitry to provide a load current; first and second output electrodes for coupling to a predetermined load impedance; and differential voltage mode amplifier circuitry coupled to said current source circuitry, said differential current mode amplifier circuitry, and said first and second output electrodes, and responsive to said differential drive signal by conducting said load current via said load impedance when said load impedance is coupled to said first and second output electrodes, wherein said differential voltage mode amplifier circuitry includes a first circuit branch including a first resistance and first and second transistors coupled in series to said current source circuitry and to said first output electrode; and a second circuit branch including a second resistance and third and fourth transistors coupled in series to said current source circuitry and to said second output electrode; wherein, when said load impedance is coupled to said first and second output electrodes, said load current is conducted via said load impedance by said first resistance and first and fourth transistors in alternation with said second resistance and second and third transistors, and said alternating conductances of said load current by said second and fourth transistors are controlled by said third and first transistors, respectively.