Multiplying digital to analog converter and multipath pipe line analog to digital converter using the same

A multiplying digital to analog converter comprising:

• a digital to analog converter having a plurality of capacitors coupled in parallel, applying first signals to the capacitors during a sampling period, and applying second signals to the capacitors during an amplifying period, depending on polarity of an input analog signal, the digital to analog converter further includes a first digital to analog converter receiving a positive voltage;
• and a second digital to analog converter receiving a negative voltage;
• and
• an amplifier including,
• a first amplifier coupled to the digital to analog converter,
• a second amplifier coupled to the first amplifier,
• a first capacitor coupled between an input end and an output end of the second amplifier,
• a second capacitor coupled to bother ends of the first capacitor, and
• a first switch coupled between the first and second capacitors, being turned on during the sampling period, and being turned off during the amplifying periods,
• wherein, depending on polarity of an analog signal to be amplified,
• the first amplifier amplifies a positive voltage, and
• the second amplifier amplifies a negative voltage.

A multiplying digital to analog converter comprising:

• a digital to analog converter having a plurality of capacitors coupled in parallel, applying first signals to the capacitors during a sampling period, and applying second signals to the capacitors during an amplifying period, depending on polarity of an input analog signal, the digital to analog converter further includes a first digital to analog converter receiving a positive voltage;
• and a second digital to analog converter receiving a negative voltage;
• and
• an amplifier including
• a first amplifier coupled to the digital to an analog converter,
• a second amplifier coupled to the first amplifier, and
• a bias input end coupled to an end of the first amplifier and an end of the second amplifier, and controlling currents of the first and second amplifiers,
• wherein, depending on polarity of an analog signal to be amplified,
• the first amplifier amplifies a positive voltage, and
• the second amplifier amplifies a negative voltage.