A high-speed serial interface is provided. In one aspect, the high-speed serial interface uses three phase modulation for jointly encoding data and clock information. Accordingly, the need for de-skewing circuitry at the receiving end of the interface is eliminated, resulting in reduced link start-up time and improved link efficiency and power consumption. In one embodiment, the high-speed serial interface uses fewer signal conductors than conventional systems having separate conductors for data and clock information. In another embodiment, the serial interface allows for data to be transmitted at any speed without the receiving end having prior knowledge of the transmission data rate. In another aspect, the high-speed serial interface uses polarity encoded three phase modulation for jointly encoding data and clock information. This further increases the link capacity of the serial interface by allowing for more than one bit to be transmitted in any single baud interval.

System, methods and apparatus are described that facilitate transmission of data, particularly between two devices within an electronic apparatus. Information is transmitted in N-phase polarity encoded symbols. Data is encoded in multi-bit symbols, and the multi-bit symbols are transmitted on a plurality of connectors. The multi-bit symbols may be transmitted by mapping the symbols to a sequence of states of the plurality of connectors, and driving the connectors in accordance with the sequence of states. The timing of the sequence of states is determinable at a receiver at each transition between sequential states. The state of each connector may be defined by polarity and direction of rotation of a multi-phase signal transmitted on the each connector.

A capacitive coupling circuit device is provided with a capacitive coupling circuit and a ground-side feedback circuit. The capacitive coupling circuit demodulates a modulated signal, which is obtained by modulating an input signal and transmitting a modulated input signal through a coupling capacitor. The ground-side feedback circuit is inserted between a first ground terminal on a signal input side of the capacitive coupling circuit and a second ground terminal on a signal output side of the capacitive coupling circuit. The ground-side feedback circuit is configured by connecting a second capacitor in series to a parallel circuit of a first capacitor and a first resistor. Alternatively, the ground-side feedback circuit may be configured by connecting the second capacitor and a third capacitor in series to both ends of the parallel circuit of the first capacitor and the first resistor, respectively.

A bias structure includes a reference voltage node connected to gate structures of a first NMOS transistor and a second NMOS transistor, a bias voltage node comprising a bias voltage, and a first op amp having a first input connected to the reference voltage, a second input connected to a drain of the first NMOS transistor, and an output connected to gate structures of a first PMOS transistor and a second PMOS transistor. The bias structure further includes a second op amp having a first input connected to the reference voltage, a second input connected to a drain of the second NMOS transistor, and an output connected to a gate structure of a third NMOS transistor and the bias voltage node. The first NMOS transistor matches a transistor of a differential pair of an integrated circuit device.

A transmission device of the disclosure includes: a generator unit that generates, on the basis of a control signal, a transmission symbol signal that indicates a sequence of transmission symbols; an output control unit that generates an output control signal on the basis of the transmission symbol signal; and a driver unit that generates, on the basis of the output control signal, a first output signal, a second output signal, and a third output signal. The generator unit generates the transmission symbol signal on the basis of the control signal, to allow the first output signal, the second output signal, and the third output signal to exchange signal patterns with one another.

A semiconductor circuitry includes a first circuitry having a differential transistor pair and a pair of current sources connected in series to the differential transistor pair, a pair of transmission lines connected to the differential transistor pair at the opposite side to the current sources, and a second circuitry, connected to a node between the differential transistor pair and the current sources, and configured to test operations of at least the differential transistor pair and a latter-stage circuity connected to the transmission lines, in the state where the current outputs of the pair of current sources are stopped.

A transmission device of the disclosure includes: a generator unit that generates, on the basis of a control signal, a transmission symbol signal that indicates a sequence of transmission symbols; an output control unit that generates an output control signal on the basis of the transmission symbol signal; and a driver unit that generates, on the basis of the output control signal, a first output signal, a second output signal, and a third output signal. The generator unit generates the transmission symbol signal on the basis of the control signal, to allow the first output signal, the second output signal, and the third output signal to exchange signal patterns with one another.

A capacitive coupling circuit device is provided with a capacitive coupling circuit and a ground-side feedback circuit. The capacitive coupling circuit demodulates a modulated signal, which is obtained by modulating an input signal and transmitting a modulated input signal through a coupling capacitor. The ground-side feedback circuit is inserted between a first ground terminal on a signal input side of the capacitive coupling circuit and a second ground terminal on a signal output side of the capacitive coupling circuit. The ground-side feedback circuit is configured by connecting a second capacitor in series to a parallel circuit of a first capacitor and a first resistor. Alternatively, the ground-side feedback circuit may be configured by connecting the second capacitor and a third capacitor in series to both ends of the parallel circuit of the first capacitor and the first resistor, respectively.

A transmission device of the disclosure includes: a generator unit that generates, on the basis of a control signal, a transmission symbol signal that indicates a sequence of transmission symbols; an output control unit that generates an output control signal on the basis of the transmission symbol signal; and a driver unit that generates, on the basis of the output control signal, a first output signal, a second output signal, and a third output signal. The generator unit generates the transmission symbol signal on the basis of the control signal, to allow the first output signal, the second output signal, and the third output signal to exchange signal patterns with one another.

A transmission device of the disclosure includes: a generator unit that generates, on the basis of a control signal, a transmission symbol signal that indicates a sequence of transmission symbols; an output control unit that generates an output control signal on the basis of the transmission symbol signal; and a driver unit that generates, on the basis of the output control signal, a first output signal, a second output signal, and a third output signal. The generator unit generates the transmission symbol signal on the basis of the control signal, to allow the first output signal, the second output signal, and the third output signal to exchange signal patterns with one another.