A digital to analog converter, DAC, circuit comprising: a pulse generator circuit, the pulse generator circuit including an output for providing a pulse signal of voltage pulses having a predetermined length and shape, wherein the pulse generator circuit includes a capacitor and a reference current circuit, wherein the predetermined length of the voltage pulses is dependent upon a capacitance of the capacitor and an amount of reference current produced by the reference current circuit; a voltage to current circuit comprising: a first input to receive the pulse signal; a second input to receive a digital signal having a digital value carried on a number, N, of digital signal lines; a set of N switchable resistors including switches (281, 285, 289, 293) for selectively coupling the resistors to a source current path, wherein a resistance value of the set with respect to the source current path is controlled by the digital value; an output to provide an output pulse signal of current pulses generated from the pulse signal, wherein a current amplitude of each current pulse of the output pulse signal is dependent upon the resistance value and is indicative of the digital value, and the source current path comprising a transistor, wherein a conductivity of the transistor is controlled by the pulse signal, the transistor including a first current terminal directionally coupled to the output of the voltage to current circuit and a second current terminal directionally coupled to the set of switchable resistors. a pulse generator circuit, the pulse generator circuit including an output for providing a pulse signal of voltage pulses having a predetermined length and shape, wherein the pulse generator circuit includes a capacitor and a reference current circuit, wherein the predetermined length of the voltage pulses is dependent upon a capacitance of the capacitor and an amount of reference current produced by the reference current circuit; a voltage to current circuit comprising: a first input to receive the pulse signal; a second input to receive a digital signal having a digital value carried on a number, N, of digital signal lines; a set of N switchable resistors including switches (281, 285, 289, 293) for selectively coupling the resistors to a source current path, wherein a resistance value of the set with respect to the source current path is controlled by the digital value; an output to provide an output pulse signal of current pulses generated from the pulse signal, wherein a current amplitude of each current pulse of the output pulse signal is dependent upon the resistance value and is indicative of the digital value, and the source current path comprising a transistor, wherein a conductivity of the transistor is controlled by the pulse signal, the transistor including a first current terminal directionally coupled to the output of the voltage to current circuit and a second current terminal directionally coupled to the set of switchable resistors. a first input to receive the pulse signal; a second input to receive a digital signal having a digital value carried on a number, N, of digital signal lines; a set of N switchable resistors including switches (281, 285, 289, 293) for selectively coupling the resistors to a source current path, wherein a resistance value of the set with respect to the source current path is controlled by the digital value; an output to provide an output pulse signal of current pulses generated from the pulse signal, wherein a current amplitude of each current pulse of the output pulse signal is dependent upon the resistance value and is indicative of the digital value, and the source current path comprising a transistor, wherein a conductivity of the transistor is controlled by the pulse signal, the transistor including a first current terminal directionally coupled to the output of the voltage to current circuit and a second current terminal directionally coupled to the set of switchable resistors.