Abstract:
A power amplifier cell (402) comprising: a first power amplifier (410), a second power amplifier (416) and a balun (422). The balun (422) comprising: a first transmission line (430); a second transmission line (432); a third transmission line (434); a fourth transmission line (436); and a biasing circuit (438) connected between a reference terminal (409), and a second end (460) of the second transmission line (432) and a second end of the fourth transmission line (436).
Abstract:
Disclosed is a charge pump protection device including a power supply voltage, a charge pump to produce an output voltage higher than the power supply voltage, the charge pump including, a pumping capacitor to store voltage during a charging state and to discharge the voltage during a pumping state thereof, a plurality of switches to regulate the charging and pumping states, a charge pump capacitor to store the output voltage, and at least one current limiter in series with at least one of the plurality of switches to limit current and prevent an electrical failure of the charge pump.
Abstract:
An envelope detector (ED) includes a voltage-mode ED core including parallel detection transistors for detecting a voltage envelope of a radio frequency (RF) signal input, the RF signal input including an output of a radio such as a cellular transmitter (TX). The ED further includes multiple voltage amplifiers positioned serially in gain stages between the TX output and the ED core to provide a total linear voltage range of the envelope detector. A final voltage amplifier of the multiple voltage amplifiers drives the ED core and includes a class-AB RF amplifier configured to operate within a full linear voltage range of the ED core.
Abstract:
An envelope detector (ED) includes a voltage-mode ED core including parallel detection transistors for detecting a voltage envelope of a radio frequency (RF) signal input, the RF signal input including an output of a radio such as a cellular transmitter (TX). The ED further includes multiple voltage amplifiers positioned serially in gain stages between the TX output and the ED core to provide a total linear voltage range of the envelope detector. A final voltage amplifier of the multiple voltage amplifiers drives the ED core and includes a class-AB RF amplifier configured to operate within a full linear voltage range of the ED core.
Abstract:
A power amplifier includes an input module. The input module includes a transformer and is configured to receive a radio frequency signal and generate output signals. Impedance transformation modules each of which having an output impedance and configured to receive a respective one of the output signals from the transformer. Switch modules each of which comprising a transistor and connected to an output of one of the impedance transformation modules. The transistor has an input impedance and outputs an amplified signal. Each of the output impedances is mismatched relative to a respective one of the input impedances.
Abstract:
The invention relates to a push-pull amplifier for amplifying an input signal (e) which is to be amplified to an output signal (a), having a first and a second amplifier element (1, 1'). According to the invention, each of the two amplifier elements (1, 1') has a current-emitting electrode (2, 2'), a current-collecting electrode (3, 3') and a current-controlling electrode (4, 4'). The input signal (e) is supplied to the current-controlling electrodes (4, 4') of the amplifier elements (1, 1') via a respective input connection (6, 6') and a respective input inductor (5, 5') arranged between the respective input connection (6, 6') and the respective current-controlling electrode (4, 4'). The current-collecting electrodes (3, 3') are connected via a respective supply inductor (7, 7') having a common supply voltage (V+). The current-emitting electrodes (2, 2') of the amplifier elements (1, 1') are connected to the current-collecting electrode (3, 3') of the other amplifier element (1', 1) via a respective capacitor (8, 8'). The current-emitting electrodes (2, 2') are connected to output connections (9, 9') on which the output signal (a) can be picked up. The current-emitting electrodes (2, 2') are connected via a respective output inductor (10, 10') to a reference potential. The supply inductors (7, 7') of the amplifier elements (1, 1') are inductively coupled to the input inductors (5', 5) and the output inductors (10', 10) of the respectively other amplifier element (1', 1).
Abstract:
L'invention concerne un amplificateur comportant : un étage de sortie (1) dont deux premières bornes (15, 17) d'alimentation sont adaptées à recevoir une première tension définie par des premiers potentiels variables positif (+V2) et négatif (-V2) par rapport à un potentiel de référence ; et un circuit (2) d'asservissement du courant dans des transistors de l'étage de sortie à une valeur de référence, dans lequel l'étage de sortie comporte un premier et un deuxième transistors MOS (MNh, MNl) en série entre les deux premières bornes, le point milieu de cette association en série définissant une borne (OUT) de sortie de l'amplificateur ; le circuit d'asservissement comporte deux transistors MOS de mesure (N21, N22) dont les sources et grilles respectives sont couplées aux sources et grilles respectives des premier et deuxième transistors de l'étage de sortie ; au moins une branche de commande (23, 24 ; 23'), comportant des transistors en série entre deux bornes d'application d'une deuxième tension, définit des noeuds (11, 13) reliés aux grilles des transistors de sortie, ladite deuxième tension étant supérieure à la première.
Abstract:
A voltage standing wave ratio (VSWR) detector (1600) is provided. The voltage standing wave ratio (VSWR) detector (1600) includes a power amplifier over-voltage indication circuit generating an output (1602); a power amplifier over-current indication circuit generating an output (1604), a decision circuit receiving the power amplifier over-voltage indication circuit output (1602) and the power amplifier over-current indication circuit output (1604) and generating an output based on the power amplifier over-voltage indication circuit output (1602) and the power amplifier over-current indication circuit output (1604), and one or more power control actuation circuits (1206) receiving the decision circuit output and adjusting a power level of a power amplifier (1202).