Apparatus and methods for single phase spot circuits

A time-to-digital converter comprising:

• two or more spot circuits electrically connected in a cascade and comprising a first single phase spot circuit having a spot input, a spot output, and a clock input, wherein the first single phase spot circuit comprises:
• a first input field effect transistor (FET) of a first polarity and electrically connected between a first supply node and a signal node, wherein a gate of the first FET is electrically connected to the spot input;
• a clock FET of a second polarity opposite the first polarity and electrically connected to the clock input;
• a second input FET of the second polarity and electrically connected in series with the clock FET between the signal node and a second supply node;
• and
• an output FET of the first polarity and electrically connected between the first supply node and the spot output, wherein a gate of output FET is electrically connected to the signal node.

A method in an electronic circuit of moving a spot using a single clock signal phase, the method comprising:

• providing a spot signal to a spot input of a single phase spot circuit of the electronic circuit;
• providing a single phase clock signal varying between a first logic voltage and a second logic voltage to a clock input of the single phase spot circuit;
• blocking transmission of the spot signal to a spot output of the single phase spot circuit using a plurality of field effect transistors of the single phase spot circuit when the spot signal has the first logic voltage;
• and
• transmitting the data signal to the data output of the single phase spot circuit using the plurality of field effect transistors in response to a clock edge of the single phase clock signal when the data input has the second logic voltage.