The TSG4100A Series are affordable high performance signal generators which support both analog and digital modulation. They are available in three frequency configurations DC to 2 GHz, 4 GHz and 6 GHz. The instruments provide spur-free outputs with low phase noise (113 dBc/Hz at 1 GHz), outstanding amplitude accuracy (+/- 0.4 dB at 1 GHz) and excellent frequency resolution (1 MHz at any frequency). An oven-controlled crystal oscillator time-base provides 0.002 ppm temperature stability and 0.05 ppm aging stability, the most accurate and stable available for a mid-range signal generator.