Abstract: Provided is a process proximity effect correction method capable of efficiently improving the dispersion of patterns. There is a process proximity effect correction method according to some embodiments, the process proximity effect correction method of a process proximity effect correction device for performing process proximity effect correction (PPC) of a plurality of patterns using a machine learning module executed by a processor, comprising: training a sensitivity model by inputting a layout image of the plurality of patterns and a layout critical dimension (CD) of the plurality of patterns into the machine learning module; estimating an after cleaning inspection critical dimension (ACI-CD) sensitivity prediction value of the plurality of patterns by inferring an ACI-CD prediction value of the plurality of patterns; and determining a correction rate of the layout CD of the plurality of patterns using the estimated sensitivity prediction value.

Abstract: A yield prediction apparatus is provided. The yield prediction apparatus may include at least one processor coupled to at least one non-transitory computer-readable medium. The at least one processor may be configured to receive a first variable associated with operating characteristics of a semiconductor device, perform a simulation for the operating characteristics of the semiconductor device, perform a neural network regression analysis using a result of the simulation to determine a first function for the first variable, and predict a yield of the semiconductor integrated circuit based on an advanced Monte Carlo simulation. An input of the advanced Monte Carlo simulation may include the determined first function.

Abstract: A yield prediction apparatus is provided. The yield prediction apparatus may include at least one processor coupled to at least one non-transitory computer-readable medium. The at least one processor may be configured to receive a first variable associated with operating characteristics of a semiconductor device, perform a simulation for the operating characteristics of the semiconductor device, perform a neural network regression analysis using a result of the simulation to determine a first function for the first variable, and predict a yield of the semiconductor integrated circuit based on an advanced Monte Carlo simulation. An input of the advanced Monte Carlo simulation may include the determined first function.

Abstract: An exponential function generator embodied by a CMOS process and a variable gain amplifier (VGA) employing the same. Since it is difficult for CMOS devices to attain an exponential function by themselves, the exponential function generator employs a scheme of generating two voltage signals varying with different slopes for a control voltage and summing up the two voltage signals so as to obtain an approximated exponential function. Further, the VGA is designed capable of being implemented by the CMOS process and performs only fixed gain amplification at an input stage by considering the deterioration of features of CMOS devices, linearly changes the gain by providing an exponential control current to a variable gain cell performing the practical gain variation for its bias control, and constructs a load by using FETs operating in an ohmic region to perform a stabilized operation regardless of variations in external factors.

Abstract: An exponential function generator embodied by a CMOS process and a variable gain amplifier (VGA) employing the same. Since it is difficult for CMOS devices to attain an exponential function by themselves, the exponential function generator employs a scheme of generating two voltage signals varying with different slopes for a control voltage and summing up the two voltage signals so as to obtain an approximated exponential function. Further, the VGA is designed capable of being implemented by the CMOS process and performs only fixed gain amplification at an input stage by considering the deterioration of features of CMOS devices, linearly changes the gain by providing an exponential control current to a variable gain cell performing the practical gain variation for its bias control, and constructs a load by using FETs operating in an ohmic region to perform a stabilized operation regardless of variations in external factors.

Abstract: A wide band linear gain control amplifier for a mobile communications system, which can be easily implemented by standard CMOS fabrication processes for forming into an integrated circuit. The linear gain control amplifier is responsive to a basic control signal and includes a compensating circuit unit for outputting a gain-compensated first control voltage that is substantially stable against changes in temperature and changes in source voltage, and which has an exponential relation to the basic control signal, and for outputting a second control voltage associated with the first control signal; a variable gain amplification unit for gain-controlling an input signal according to the first control voltage to output an amplification signal and for keeping the gain of the amplification signal for the input signal substantially constant even if a source voltage changes; and a driving amplification unit for amplifying the amplification signal to a predetermined level.

Abstract: A wide band linear gain control amplifier for a mobile communications system, which can be easily implemented by standard CMOS fabrication processes for forming into an integrated circuit. The linear gain control amplifier is responsive to a basic control signal and includes a compensating circuit unit for outputting a gain-compensated first control voltage that is substantially stable against changes in temperature and changes in source voltage, and which has an exponential relation to the basic control signal, and for outputting a second control voltage associated with the first control signal; a variable gain amplification unit for gain-controlling an input signal according to the first control voltage to output an amplification signal and for keeping the gain of the amplification signal for the input signal substantially constant even if a source voltage changes; and a driving amplification unit for amplifying the amplification signal to a predetermined level.

Abstract: A linear gain control amplifier includes a compensation circuit receiving an external loop control output, outputs a compensation signal approximated to an exponential function thereof, and is implemented in a standard CMOS process. A first amplifier amplifies an input signal in accordance with the compensation signal, a frequency compensation circuit compensates the phase shift of the first amplifier, a second amplifier amplifies an output of the frequency compensation circuit in accordance with the compensation signal, and a tank circuit is connected with the output terminal of the second amplifier to obtain a gain linearity as is required for a mobile communication terminal and a wide variable gain control range.

Abstract: The present invention relates to a signal compressing circuit which amplifies an input signal on a logarithmic scale in an appropriate range, and has a variable gain stage, an input signal detector, and an automatic level controlling circuit, the automatic level controlling circuit including: a first comparator for comparing the input signal to a first reference voltage, and generating a signal proportional to the difference between them; a second comparator for comparing the input signal to a second reference voltage, and generating a signal proportional to the difference between them; and a current mirror for generating a controlling current in proportion to the output signal of the first and second comparators, thus controlling the gain of the variable gain stage in two steps so as to generate stable output signals.

Abstract: A signal compressing apparatus is disclosed, which controls output signal in case of exceeding input signal to increase transmission efficiency and obtains stable output due to temperature compensation. The signal compressing apparatus includes an amplifier for amplifying an input signal applied through an input resistor connected to an input terminal at a constant gain, and a gain controller for rectifying only a specific band signal of output signals of the amplifier between the input terminal of the amplifier and an output terminal thereof, compensating temperature of the rectified signal, and outputting a control signal to allow the gain of the amplifier to be constant.