Current source for reducing noise glitches generated in a digital to analog converter and method therefor

A switchable current source for a Digital to Analog Converter (DAC) comprising:

• a first flip flop having an input coupled to a first input of the switchable current source, a clock input coupled for receiving a first clock signal, and an output;
• a second flip flop having an input coupled to said first input of the switchable current source, a clock input coupled for receiving a second clock signal, and an output;
• a first switch having a first terminal coupled to said output of said first flip flop, a control terminal coupled for receiving a third clock signal, and a second terminal;
• a second switch having a first terminal coupled to said output of said second flip flop, a control terminal coupled for receiving a fourth clock signal, and a second terminal coupled to said second terminal of said first switch;
• a third flip flop having an input coupled to a second input of the switchable current source, a clock input coupled for receiving said first clock signal, and an output;
• a fourth flip flop having an input coupled to said first input of the switchable current source, a clock input coupled for receiving said second clock signal, and an output;
• a third switch having a first terminal coupled to said output of said third flip flop, a control terminal coupled for receiving said third clock signal, and a second terminal;
• a fourth switch having a first terminal coupled to said output of said fourth flip flop, a control terminal coupled for receiving said fourth clock signal, and a second terminal coupled to said second terminal of said third switch;
• a first transistor having a first electrode coupled to a first output of the switchable current source, a control electrode coupled to said second terminal of said first switch, and a second electrode;
• a second transistor having a first electrode coupled to a second output of the switchable current source, a control electrode coupled to said second terminal of said third switch, and a second electrode coupled to said second electrode of said first transistor;
• and
• a current source having a first terminal coupled to said second electrode of said first transistor and a second terminal coupled for receiving a power supply voltage.