摘要:
A self-biased amplifier circuit (100; 200), comprises: an input, wherein the input comprises input transistors (110, 112, 114, 116; 210, 212, 214, 216) forming inverters; bias transistors (118, 120, 122, 124; 218, 222), wherein a source of each input transistor (110, 112, 114, 116; 210, 212, 214, 216) is connected to a drain of a bias transistor (118, 120, 122, 124; 218, 222) for providing a bias current to the inverters; an output connected to a first output node (106; 206) and/or a second output node (108; 208); and pairs of transistor switches (126, 128; 226, 228) connected between the first (106; 206) or the second output node (108; 208) and a respective gate of the bias transistors (118, 120, 122, 124; 218, 222), wherein the pairs of transistor switches (126, 128; 226, 228) are configured to control the self-biased amplifier circuit (100; 200) to assume an active mode or a standby mode.
摘要:
This invention relates to a power amplifier device, comprising: - An amplifier component (A), operable to receive an input signal (s i ) and to provide an amplified output signal (s o ), according to a control signal (ctrl); - An envelope tracking modulator (ET), providing the control signal (ctrl) according to a static voltage (V s ) and a dynamic voltage (V D ); - A power supply (S) providing said static and dynamic voltages according to measurements performed by a power sensor (PS) on the amplified output signal, so that the static voltage (Vs) is determined as a mean value of the output signal (So) over a predetermined time duration.
摘要:
A circuit method includes periodically increasing a tail current of a differential stage of a comparator to periodically power on the differential stage to a power-on state, and periodically decreasing the tail current of the differential stage to periodically power down the differential stage to a low-power state. The periodically increasing of the tail current and the periodically decreasing of the tail current are asynchronous operations for powering on the differential stage to the power-on state and powering down the differential stage to the low-power state. Periodically increasing the tail current and the periodically decreasing the tail current asynchronously for powering on the differential stage to the power-on state and powering down the differential stage to the low-power state provide for low noise and high speed during signal comparison.
摘要:
A transmitter for a portable electronic device comprises a mixer, a digital-to- analogue converter (204), a driver stage (210) and a power amplifier (212). The transmitter comprises furthermore a control circuit (220, 228) that is connected to the output of the power amplifier and to a look-up table (226) including values corresponding to ramp functions. By comparing the level of the transmitter output signal with target values provided eg. by said look-up table, an error signal is generated which in turn is used to adjust the gain and bias settings of at least one of the transmitter stages, eg. the power amplifier (212) or its driver stage (210).
摘要:
An RF amplification device includes: amplification elements (Q11, Q12) for amplifying a radio frequency input signal (Pin_LB) of radio communication; and transmission line transformers (TLT11, 12) connected to the input electrode or the output electrode of the amplification elements. The TLT11, 12 include a main line (Lout) arranged between the input and the output and a sub line (Lin) arranged between the input or the output and an AC contact point and connected to the main line (Lout). When an operation voltage Vdd different from a grounding voltage level (GND) is applied to the AC contact point, the operation voltage is supplied to the output electrodes of the amplification elements (Q11, Q12) via the sub line (Lin) from the AC contact point. This eliminates increase of a module height of an RF module when realizing a high-performance load circuit in the RF amplification device and eliminates increase of the area occupied by the load circuit of the high-frequency amplifier formed by a semiconductor chip or a multi-layer line circuit substrate.
摘要:
According to an exemplary embodiment, an amplification module includes a power amplifier configured to receive an RF input signal and provide an RP output signal. The amplification module further includes an autobias control circuit configured to receive and convert the RF output signal to a control signal. The control signal can cause the power amplifier to have a quiescent current that increases substantially linearly in response to an increase in RF output power of the RF output signal. The autobias control circuit can include a peak detector/log converter circuit coupled to a first input of a differential amplifier, where the differential amplifier outputs the control signal. The autobias control circuit can further include a DC reference circuit coupled to a second input of the differential amplifier. The amplification module further includes an analog bias circuit coupling the control voltage to a bias input of said power amplifier.