This paper discusses the synthesis of switched-current filters from co
ntinuous-time prototypes by the simulation of components, particularly
capacitors and transconductors in Transconductance-C filters. The obt
ained structures implement discrete-time versions of the prototype cir
cuit using bilinear or Euler formulas. All the proposed structures wor
k with doubled effective sampling rate (sampling the input and updatin
g the output at each phase), make strict use of voltage-sampling switc
hes and naturally admit two-phases nonoverlapping clocks.