Asymmetric rise/fall time and duty cycle control circuit

A circuit for providing signal control comprising:

• a first input node configured to receive a first data signal;
• a second input node configured to receive a second data signal that is the complementary of the first data signal;
• a first bipolar transistor having a base terminal coupled to the first input node and having a collector terminal configured to be coupled to a voltage source when in operation;
• a second bipolar transistor having a base terminal coupled to the second input node and having a collector terminal configured to be coupled to the voltage source when in operation;
• a third bipolar transistor having a base terminal coupled to an emitter terminal of the first bipolar transistor;
• a fourth bipolar transistor having a base terminal coupled to an emitter terminal of the second bipolar transistor;
• a first current source coupled to an emitter terminal of both the third and fourth bipolar transistors and coupled to a first ground;
• a first resistor having a first terminal configured to be coupled to a voltage source when in operation and having a second terminal coupled to a collector terminal of the third bipolar transistor, wherein the collector terminal of the third bipolar transistor is configured to act as an a first output node for driving a load;
• a second resistor having a first terminal configured to be coupled to a voltage source when in operation and having a second terminal coupled to a collector terminal of the fourth bipolar transistor, wherein the collector terminal of the fourth bipolar transistor is configured to act as an a second output node for driving a load;
• a third input node configured to receive a third data signal;
• a fourth input node configured to receive a fourth data signal that is the complementary of the third data signal;
• a fifth bipolar transistor having a base terminal coupled to the third input node and having a collector terminal coupled to an emitter of the second bipolar transistor and the base of the fourth bipolar transistor;
• a sixth bipolar transistor having a base terminal coupled to the fourth input node and having a collector terminal coupled to an emitter of the first bipolar transistor and the base of the third bipolar transistor;
• and
• a second current source coupled to an emitter of both the fifth bipolar transistor and the sixth bipolar transistor and to a ground.

An optical transceiver module comprising:

• a signal generation stage having first and second output nodes;
• an electro-optic transducer having first and second input/output nodes;
• a rise/fall time control stage having a first input node coupled to the first output node of the signal generation stage, a second input node coupled to the second output node of the signal generation node, a first output node coupled to the first input/output node of the electro-optic transducer and having a second output node coupled to the second input/output node of the electro-optic transducer, wherein the rise/fall time control stage is configured to at least partially adjust the rise/fall time of a signal input into the electro-optic transducer;
• and
• a duty cycle control stage having a first output node coupled to the first input node of the rise/fall time stage and having a second output node coupled to the second input node of the rise/fall time stage, wherein the duty cycle control stage is configured to at least partially adjust the duty cycle of the signal input into the electro-optic transducer.