Semiconductor device and electronic device having the same

Abstract

A semiconductor device includes an antenna circuit for receiving a wireless signal, a power supply circuit generating power by the wireless signal received by the antenna circuit, and a clock generation circuit to which power is supplied. The clock generation circuit includes a ring oscillator which self-oscillates and a frequency divider which adjusts frequency of an output signal of the ring oscillator in an appropriate range. A digital circuit portion is driven by a clock having high frequency accuracy, so that a malfunction such as an incorrect operation or no response is prevented.

1 . A semiconductor device comprising:
 a battery;   a power supply circuit generating a first voltage by a power supplied from the battery; and   a clock generation circuit to which the first voltage is supplied,   wherein the clock generation circuit includes a ring oscillator for generating a self-oscillating signal of a constant period, and a frequency divider for frequency-dividing the self-oscillating signal,   wherein the ring oscillator generates the self-oscillating signal by the power supplied from the power supply circuit.   
     
     
         2 . The semiconductor device according to  claim 1 , wherein the battery is formed in a sheet shape. 
     
     
         3 . The semiconductor device according to  claim 1 , wherein the battery is a lithium battery, a lithium polymer battery, or a lithium ion battery. 
     
     
         4 . A semiconductor device comprising:
 a battery;   a power supply circuit generating a first voltage by a power supplied from the battery;   an antenna for receiving a wireless signal;   a data modulation circuit for modulating the wireless signal;   a data demodulation circuit for demodulating a signal modulated by the data modulation circuit;   a control circuit operationally connected to the data modulation circuit and the data demodulation circuit; and   a clock generation circuit to which the first voltage is supplied,   wherein the clock generation circuit includes a ring oscillator for generating a self-oscillating signal of a constant period, and a frequency divider for frequency-dividing the self-oscillating signal,   wherein the ring oscillator generates the self-oscillating signal by the power supplied from the power supply circuit.   
     
     
         5 . The semiconductor device according to  claim 4 , wherein the battery is formed in a sheet shape. 
     
     
         6 . The semiconductor device according to  claim 4 , wherein the battery is a lithium battery, a lithium polymer battery, or a lithium ion battery. 
     
     
         7 . The semiconductor device according to  claim 4 , wherein the antenna is a dipole antenna, a patch antenna, a loop antenna or a Yagi antenna. 
     
     
         8 . A semiconductor device comprising:
 a battery;   a power supply circuit generating a first voltage by a power supplied from the battery; and   a clock generation circuit to which the first voltage is supplied,   wherein the clock generation circuit includes a ring oscillator for generating a self-oscillating signal of a constant period, and a frequency divider for frequency-dividing the self-oscillating signal,   wherein the ring oscillator generates the self-oscillating signal by the power supplied from the power supply circuit,   wherein the ring oscillator comprises at least a first stage and a second stage, and   wherein each of the first stage and the second stage comprises an input terminal, an output terminal, a first transistor, a second transistor, a third transistor and a fourth transistor.   
     
     
         9 . The semiconductor device according to  claim 8 , wherein the battery is formed in a sheet shape. 
     
     
         10 . The semiconductor device according to  claim 8 , wherein the battery is a lithium battery, a lithium polymer battery, or a lithium ion battery. 
     
     
         11 . A semiconductor device comprising:
 a battery;   a power supply circuit generating a first voltage by a power supplied from the battery;   an antenna for receiving a wireless signal;   a data modulation circuit for modulating the wireless signal;   a data demodulation circuit for demodulating a signal modulated by the data modulation circuit;   a control circuit operationally connected to the data modulation circuit and the data demodulation circuit; and   a clock generation circuit to which the first voltage is supplied,   wherein the clock generation circuit includes a ring oscillator for generating a self-oscillating signal of a constant period, and a frequency divider for frequency-dividing the self-oscillating signal,   wherein the ring oscillator generates the self-oscillating signal by the power supplied from the power supply circuit,   wherein the ring oscillator comprises at least a first stage and a second stage, and   wherein each of the first stage and the second stage comprises an input terminal, an output terminal, a first transistor, a second transistor, a third transistor and a fourth transistor.   
     
     
         12 . The semiconductor device according to  claim 11 , wherein the battery is formed in a sheet shape. 
     
     
         13 . The semiconductor device according to  claim 11 , wherein the battery is a lithium battery, a lithium polymer battery, or a lithium ion battery. 
     
     
         14 . The semiconductor device according to  claim 11 , wherein the antenna is a dipole antenna, a patch antenna, a loop antenna or a Yagi antenna.